feat: add test provider config endpoint

Add GET /api/payload-billing/test/config endpoint to retrieve test provider configuration including scenarios, payment methods, and test mode indicators.

This allows custom UIs to dynamically sync with plugin configuration instead of hardcoding values.

- Add TestProviderConfigResponse interface
- Export new type in provider index and main index
- Endpoint returns enabled status, scenarios, methods, test mode indicators, default delay, and custom UI route

Resolves #22

Co-authored-by: Bas <bvdaakster@users.noreply.github.com>

.github/CLAUDE_PR_ASSISTANT.md

@@ -1,235 +0,0 @@
-# Claude PR Assistant
-
-This workflow allows Claude to assist with Pull Requests by implementing improvements, fixes, and changes directly on the PR branch when mentioned in comments.
-
-## How to Use
-
-### 1. Comment on Any PR
-
-Use one of these trigger commands in a comment on any open pull request:
-
-- `@claude implement` - Implement new features or functionality
-- `@claude fix` - Fix bugs or issues in the PR
-- `@claude improve` - Improve existing code quality
-- `@claude update` - Update code to match requirements
-- `@claude refactor` - Refactor code for better structure
-- `@claude help` - General assistance with the PR
-
-### 2. Example Usage
-
-```
-@claude fix
-
-Please fix the TypeScript errors in the payments collection and ensure proper typing for the provider data field.
-```
-
-```
-@claude improve
-
-Can you optimize the invoice generation logic and add better error handling?
-```
-
-```
-@claude implement
-
-Add validation for email addresses in the customer billing information fields. Make sure it follows the existing validation patterns.
-```
-
-## What Happens
-
-1. **Permission Check**: Verifies you are `bvdaakster` (only authorized user)
-2. **PR Analysis**: Claude analyzes the current PR context and changes
-3. **Implementation**: Makes the requested changes directly on the PR branch
-4. **Quality Checks**: Runs build, typecheck, and lint
-5. **Commit & Push**: Commits changes with descriptive messages
-6. **Notification**: Updates the PR with completion status
-
-## Features
-
-### ✅ Direct PR Modification
-- Works directly on the existing PR branch
-- No new branches or PRs created
-- Changes appear immediately in the PR
-
-### ✅ Smart Context Awareness
-- Understands the current PR changes
-- Analyzes existing code patterns
-- Maintains consistency with the codebase
-
-### ✅ Comprehensive Request Handling
-- Code improvements and refactoring
-- Bug fixes within the PR
-- Adding missing features
-- Documentation updates
-- Type error fixes
-- Performance optimizations
-- Test additions
-
-### ✅ Quality Assurance
-- Follows TypeScript conventions
-- Uses ESM module structure
-- Runs automated quality checks
-- Maintains coding standards
-
-## Command Reference
-
-| Command | Purpose | Example |
-|---------|---------|---------|
-| `@claude implement` | Add new functionality | "implement user authentication" |
-| `@claude fix` | Fix bugs or errors | "fix the validation logic" |
-| `@claude improve` | Enhance existing code | "improve performance of query" |
-| `@claude update` | Update to requirements | "update to use new API format" |
-| `@claude refactor` | Restructure code | "refactor into smaller functions" |
-| `@claude help` | General assistance | "help with error handling" |
-
-## Examples
-
-### Bug Fix Request
-```
-@claude fix
-
-There's a TypeScript error in `src/providers/stripe.ts` on line 45. The `amount` property is missing from the payment object. Please fix this and ensure proper typing.
-```
-
-### Feature Implementation
-```
-@claude implement
-
-Add support for recurring payments in the Stripe provider. Follow the same pattern as the Mollie provider and include proper webhook handling.
-```
-
-### Code Improvement
-```
-@claude improve
-
-The `validatePayment` function in utils.ts is getting complex. Please refactor it to be more readable and add proper error messages for each validation case.
-```
-
-### Documentation Update
-```
-@claude update
-
-Update the JSDoc comments in the billing plugin configuration to include examples of how to use the new customer info extractor feature.
-```
-
-## Response Types
-
-### Success Response
-```
-✅ PR Assistance Complete!
-
-🔧 Changes Made:
-- ✅ Analyzed PR context and requirements
-- ✅ Implemented requested improvements/fixes
-- ✅ Followed project coding standards
-- ✅ Updated the current PR branch
-
-Changes are ready for review! 🚀
-```
-
-### No Changes Response
-```
-ℹ️ PR Assistance Complete - No Changes
-
-Analysis Result: The requested feature is already implemented
-
-💡 Suggestions:
-- Provide more detailed requirements
-- Point to specific files or functions
-```
-
-### Error Response
-```
-❌ PR Assistance Failed
-
-🔄 Try Again:
-- Providing more specific instructions
-- Breaking down complex requests
-```
-
-## Best Practices
-
-### Clear Instructions
-- Be specific about what you want changed
-- Reference specific files or functions when possible
-- Provide context about the desired outcome
-
-### Examples of Good Requests
-```
-@claude fix the TypeScript error in src/collections/payments.ts line 42 where the status field is missing from the Payment interface
-
-@claude implement email validation in the customer billing form using the same pattern as the phone validation
-
-@claude refactor the webhook handler in providers/mollie.ts to extract the payment processing logic into separate functions
-```
-
-### Examples of Unclear Requests
-```
-@claude fix everything
-@claude make it better
-@claude help with this
-```
-
-## Limitations
-
-- **User Restriction**: Only `bvdaakster` can use this feature
-- **PR Only**: Works on pull request comments, not issue comments
-- **Open PRs**: Only works on open pull requests
-- **Branch Access**: Requires write access to the PR branch
-
-## Technical Details
-
-### Workflow Triggers
-- Event: `issue_comment` on pull requests
-- Conditions: Comment contains Claude trigger words
-- Permissions: User must be `bvdaakster`
-
-### Quality Checks
-Claude automatically runs:
-- `pnpm build` - Verify code compiles
-- `pnpm typecheck` - Check TypeScript types
-- `pnpm lint` - Ensure code style compliance
-- `npm run test` - Run test suite (if available)
-
-### Commit Messages
-Automatic commits include:
-- Description of the request
-- PR number and requester
-- Claude attribution
-- Proper co-authoring
-
-### Branch Strategy
-- Works directly on the PR's head branch
-- No additional branches created
-- Changes pushed to existing PR
-- Maintains PR history
-
-## Troubleshooting
-
-### Common Issues
-
-1. **Permission Denied**
-   - Only `bvdaakster` can use Claude PR assistance
-   - Verify you're commenting as the correct user
-
-2. **No Changes Made**
-   - Request might be unclear or already implemented
-   - Try providing more specific instructions
-   - Reference specific files or lines
-
-3. **Workflow Failed**
-   - Check the Actions tab for detailed logs
-   - Verify the PR branch is accessible
-   - Ensure request is actionable
-
-### Getting Help
-
-If Claude assistance isn't working:
-1. Check the workflow logs in Actions tab
-2. Verify your request is specific and actionable
-3. Try breaking complex requests into smaller parts
-4. Use different command triggers (@claude fix vs @claude implement)
-
----
-
-**Note**: This feature uses the official Anthropic Claude Code action for reliable, production-ready assistance. All changes should be reviewed before merging.

.github/claude-config.json

@@ -1,43 +0,0 @@
-{
-  "privilegedUsers": [
-    "bvdaakster"
-  ],
-  "permissions": {
-    "issueImplementation": {
-      "strategy": "privilegedUsers",
-      "description": "Only bvdaakster can request Claude implementations"
-    },
-    "codeReview": {
-      "strategy": "privilegedUsers",
-      "description": "Only bvdaakster can trigger Claude reviews"
-    },
-    "prAssistant": {
-      "strategy": "privilegedUsers",
-      "description": "Only bvdaakster can use Claude PR assistance"
-    }
-  },
-  "workflows": {
-    "issueImplementation": {
-      "file": "claude-implement-issue.yml",
-      "triggers": ["@claude implement", "@claude fix", "@claude create"],
-      "description": "Creates new branch and PR for issue implementation"
-    },
-    "codeReview": {
-      "file": "claude-code-review.yml",
-      "triggers": ["automatic on PR"],
-      "description": "Automatic code review for PRs from privileged users"
-    },
-    "prAssistant": {
-      "file": "claude-pr-assistant.yml",
-      "triggers": ["@claude implement", "@claude fix", "@claude improve", "@claude update", "@claude refactor", "@claude help"],
-      "description": "Assists with PR improvements directly on the PR branch"
-    }
-  },
-  "strategies": {
-    "privilegedUsers": "Only users in the privilegedUsers list",
-    "adminsOnly": "Only repository admins",
-    "adminOrPrivileged": "Repository admins OR users in privilegedUsers list",
-    "orgMembersWithWrite": "Organization members with write access",
-    "everyone": "All users with repository access"
-  }
-}

.github/workflows/claude-implement-issue.yml

@@ -1,197 +0,0 @@
-name: Claude Issue Implementation
-
-on:
-  issue_comment:
-    types: [created]
-
-permissions:
-  contents: write
-  issues: write
-  pull-requests: write
-  id-token: write
-
-jobs:
-  claude-implement:
-    if: |
-      github.event.issue_comment.issue.state == 'open' &&
-      (
-        contains(github.event.comment.body, '@claude implement') ||
-        contains(github.event.comment.body, '@claude fix') ||
-        contains(github.event.comment.body, '@claude create')
-      )
-    runs-on: ubuntu-latest
-
-    steps:
-      - name: Check user permissions
-        uses: actions/github-script@v7
-        with:
-          script: |
-            if (context.actor !== 'bvdaakster') {
-              await github.rest.issues.createComment({
-                owner: context.repo.owner,
-                repo: context.repo.repo,
-                issue_number: context.issue.number,
-                body: '❌ **Access Denied**: Only bvdaakster can use Claude implementation.'
-              });
-              throw new Error('Unauthorized user');
-            }
-
-      - name: Checkout repository
-        uses: actions/checkout@v4
-        with:
-          fetch-depth: 0
-          token: ${{ secrets.GITHUB_TOKEN }}
-
-      - name: Set up Node.js
-        uses: actions/setup-node@v4
-        with:
-          node-version: '22'
-          cache: 'npm'
-
-      - name: Install pnpm
-        run: npm install -g pnpm@10.12.4
-
-      - name: Create branch
-        id: create-branch
-        run: |
-          BRANCH_NAME="claude/issue-${{ github.event.issue.number }}-$(date +%Y%m%d-%H%M%S)"
-          echo "branch_name=$BRANCH_NAME" >> $GITHUB_OUTPUT
-          git checkout -b "$BRANCH_NAME"
-          git push origin "$BRANCH_NAME"
-
-      - name: Notify start
-        uses: actions/github-script@v7
-        with:
-          script: |
-            await github.rest.issues.createComment({
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              issue_number: context.issue.number,
-              body: `🤖 **Claude Implementation Started**\n\n📋 **Issue**: #${{ github.event.issue.number }}\n🌿 **Branch**: \`${{ steps.create-branch.outputs.branch_name }}\`\n\nImplementing your request...`
-            });
-
-      - name: Implement with Claude
-        uses: anthropics/claude-code-action@beta
-        with:
-          claude_code_oauth_token: ${{ secrets.CLAUDE_CODE_OAUTH_TOKEN }}
-          direct_prompt: |
-            Please implement the feature or fix described in this GitHub issue:
-
-            **Issue #${{ github.event.issue.number }}**: ${{ github.event.issue.title }}
-
-            **Issue Description**:
-            ${{ github.event.issue.body }}
-
-            **User Request**:
-            ${{ github.event.comment.body }}
-
-            **Instructions**:
-            1. Analyze the issue requirements carefully
-            2. Follow existing code patterns and conventions
-            3. Use TypeScript with proper typing
-            4. Follow ESM module structure with .js extensions
-            5. Add tests if needed
-            6. Update documentation if necessary
-
-            This is the @xtr-dev/payload-billing plugin for PayloadCMS.
-          allowed_tools: "Bash(pnpm build),Bash(pnpm typecheck),Bash(pnpm lint),Bash(npm run test)"
-
-      - name: Check for changes
-        id: changes
-        run: |
-          if git diff --quiet && git diff --cached --quiet; then
-            echo "has_changes=false" >> $GITHUB_OUTPUT
-          else
-            echo "has_changes=true" >> $GITHUB_OUTPUT
-          fi
-
-      - name: Commit and push
-        if: steps.changes.outputs.has_changes == 'true'
-        run: |
-          git config --local user.email "action@github.com"
-          git config --local user.name "Claude Implementation Bot"
-          git add .
-          git commit -m "feat: implement issue #${{ github.event.issue.number }}
-
-          Implemented via Claude automation.
-
-          Issue: #${{ github.event.issue.number }}
-          Requested by: @${{ github.event.comment.user.login }}
-
-          🤖 Generated with Claude Code
-
-          Co-Authored-By: Claude <noreply@anthropic.com>"
-          git push origin ${{ steps.create-branch.outputs.branch_name }}
-
-      - name: Create PR
-        if: steps.changes.outputs.has_changes == 'true'
-        uses: actions/github-script@v7
-        id: create-pr
-        with:
-          script: |
-            const { data: pr } = await github.rest.pulls.create({
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              title: `🤖 Implement: ${{ github.event.issue.title }}`,
-              head: '${{ steps.create-branch.outputs.branch_name }}',
-              base: 'dev',
-              body: `## 🤖 Claude Implementation
-
-            This PR implements issue #${{ github.event.issue.number }}.
-
-            **Issue**: #${{ github.event.issue.number }}
-            **Requested by**: @${{ github.event.comment.user.login }}
-            **Branch**: \`${{ steps.create-branch.outputs.branch_name }}\`
-
-            ### Review Checklist
-            - [ ] Code follows project conventions
-            - [ ] Build passes
-            - [ ] Tests pass
-            - [ ] Implementation matches requirements
-
-            Closes #${{ github.event.issue.number }}
-
-            🤖 Generated with Claude Code`
-            });
-            return pr.number;
-
-      - name: Notify success
-        if: steps.changes.outputs.has_changes == 'true'
-        uses: actions/github-script@v7
-        with:
-          script: |
-            const prNumber = '${{ steps.create-pr.outputs.result }}';
-            await github.rest.issues.createComment({
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              issue_number: context.issue.number,
-              body: `✅ **Implementation Complete!**\n\n🎯 **Pull Request**: #${prNumber}\n🌿 **Branch**: \`${{ steps.create-branch.outputs.branch_name }}\`\n\nReady for review! 🚀`
-            });
-
-      - name: Handle no changes
-        if: steps.changes.outputs.has_changes == 'false'
-        uses: actions/github-script@v7
-        with:
-          script: |
-            await github.rest.issues.createComment({
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              issue_number: context.issue.number,
-              body: `ℹ️ **No Changes Needed**\n\nI analyzed the issue but no code changes are required.`
-            });
-
-      - name: Clean up on no changes
-        if: steps.changes.outputs.has_changes == 'false'
-        run: git push origin --delete ${{ steps.create-branch.outputs.branch_name }} || true
-
-      - name: Handle failure
-        if: failure()
-        uses: actions/github-script@v7
-        with:
-          script: |
-            await github.rest.issues.createComment({
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              issue_number: context.issue.number,
-              body: `❌ **Implementation Failed**\n\nCheck the [workflow logs](https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}) for details.`
-            });

.github/workflows/claude-pr-assistant.yml

@@ -1,172 +0,0 @@
-name: Claude PR Assistant
-
-on:
-  issue_comment:
-    types: [created]
-
-permissions:
-  contents: write
-  issues: write
-  pull-requests: write
-  id-token: write
-
-jobs:
-  claude-pr-assist:
-    if: |
-      github.event.issue.pull_request &&
-      github.event.issue_comment.issue.state == 'open' &&
-      (
-        contains(github.event.comment.body, '@claude implement') ||
-        contains(github.event.comment.body, '@claude fix') ||
-        contains(github.event.comment.body, '@claude improve') ||
-        contains(github.event.comment.body, '@claude update') ||
-        contains(github.event.comment.body, '@claude refactor') ||
-        contains(github.event.comment.body, '@claude help')
-      )
-    runs-on: ubuntu-latest
-
-    steps:
-      - name: Check user permissions
-        uses: actions/github-script@v7
-        with:
-          script: |
-            if (context.actor !== 'bvdaakster') {
-              await github.rest.issues.createComment({
-                owner: context.repo.owner,
-                repo: context.repo.repo,
-                issue_number: context.issue.number,
-                body: '❌ **Access Denied**: Only bvdaakster can use Claude PR assistance.'
-              });
-              throw new Error('Unauthorized user');
-            }
-
-      - name: Get PR details
-        id: pr-details
-        uses: actions/github-script@v7
-        with:
-          script: |
-            const { data: pr } = await github.rest.pulls.get({
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              pull_number: context.issue.number
-            });
-            return {
-              head_ref: pr.head.ref,
-              title: pr.title,
-              body: pr.body
-            };
-
-      - name: Checkout PR branch
-        uses: actions/checkout@v4
-        with:
-          fetch-depth: 0
-          ref: ${{ fromJson(steps.pr-details.outputs.result).head_ref }}
-          token: ${{ secrets.GITHUB_TOKEN }}
-
-      - name: Set up Node.js
-        uses: actions/setup-node@v4
-        with:
-          node-version: '22'
-          cache: 'npm'
-
-      - name: Install pnpm
-        run: npm install -g pnpm@10.12.4
-
-      - name: Notify start
-        uses: actions/github-script@v7
-        with:
-          script: |
-            await github.rest.issues.createComment({
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              issue_number: context.issue.number,
-              body: `🤖 **Claude PR Assistant Started**\n\n💬 **Request**: ${{ github.event.comment.body }}\n🌿 **Branch**: \`${{ fromJson(steps.pr-details.outputs.result).head_ref }}\`\n\nWorking on your request...`
-            });
-
-      - name: Assist with Claude
-        uses: anthropics/claude-code-action@beta
-        with:
-          claude_code_oauth_token: ${{ secrets.CLAUDE_CODE_OAUTH_TOKEN }}
-          direct_prompt: |
-            You are assisting with a GitHub Pull Request. Please help with this request:
-
-            **Pull Request #${{ github.event.issue.number }}**: ${{ fromJson(steps.pr-details.outputs.result).title }}
-
-            **PR Description**:
-            ${{ fromJson(steps.pr-details.outputs.result).body }}
-
-            **User Request**:
-            ${{ github.event.comment.body }}
-
-            **Instructions**:
-            1. Analyze the current PR changes and the user's request
-            2. Implement the requested improvements, fixes, or changes
-            3. Follow existing code patterns and conventions
-            4. Use TypeScript with proper typing
-            5. Follow ESM module structure with .js extensions
-            6. Run quality checks if needed
-
-            This is the @xtr-dev/payload-billing plugin for PayloadCMS.
-            Please implement the requested changes directly on this PR branch.
-          allowed_tools: "Bash(pnpm build),Bash(pnpm typecheck),Bash(pnpm lint),Bash(npm run test)"
-
-      - name: Check for changes
-        id: changes
-        run: |
-          if git diff --quiet && git diff --cached --quiet; then
-            echo "has_changes=false" >> $GITHUB_OUTPUT
-          else
-            echo "has_changes=true" >> $GITHUB_OUTPUT
-          fi
-
-      - name: Commit and push
-        if: steps.changes.outputs.has_changes == 'true'
-        run: |
-          git config --local user.email "action@github.com"
-          git config --local user.name "Claude PR Assistant"
-          git add .
-          git commit -m "feat: Claude PR assistance - ${{ github.event.comment.user.login }} request
-
-          Request: ${{ github.event.comment.body }}
-          PR: #${{ github.event.issue.number }}
-
-          🤖 Generated with Claude PR Assistant
-
-          Co-Authored-By: Claude <noreply@anthropic.com>"
-          git push origin ${{ fromJson(steps.pr-details.outputs.result).head_ref }}
-
-      - name: Notify success
-        if: steps.changes.outputs.has_changes == 'true'
-        uses: actions/github-script@v7
-        with:
-          script: |
-            await github.rest.issues.createComment({
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              issue_number: context.issue.number,
-              body: `✅ **PR Assistance Complete!**\n\n🔧 **Changes Made**: Implemented your requested improvements\n🌿 **Branch**: \`${{ fromJson(steps.pr-details.outputs.result).head_ref }}\`\n\nChanges are ready for review! 🚀`
-            });
-
-      - name: Handle no changes
-        if: steps.changes.outputs.has_changes == 'false'
-        uses: actions/github-script@v7
-        with:
-          script: |
-            await github.rest.issues.createComment({
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              issue_number: context.issue.number,
-              body: `ℹ️ **No Changes Needed**\n\nI analyzed your request but no code changes are required.`
-            });
-
-      - name: Handle failure
-        if: failure()
-        uses: actions/github-script@v7
-        with:
-          script: |
-            await github.rest.issues.createComment({
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              issue_number: context.issue.number,
-              body: `❌ **PR Assistance Failed**\n\nCheck the [workflow logs](https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}) for details.`
-            });

README.md

@@ -1,5 +1,7 @@
 # @xtr-dev/payload-billing
 
+[![npm version](https://badge.fury.io/js/@xtr-dev%2Fpayload-billing.svg)](https://badge.fury.io/js/@xtr-dev%2Fpayload-billing)
+
 A billing and payment provider plugin for PayloadCMS 3.x. Supports Stripe, Mollie, and local testing with comprehensive tracking and flexible customer data management.
 
 ⚠️ **Pre-release Warning**: This package is currently in active development (v0.1.x). Breaking changes may occur before v1.0.0. Not recommended for production use.

dev/payload.config.ts

@@ -8,7 +8,7 @@ import { fileURLToPath } from 'url'
 import { testEmailAdapter } from './helpers/testEmailAdapter'
 import { seed } from './seed'
 import billingPlugin from '../src/plugin'
-import { mollieProvider } from '../src/providers'
+import { testProvider } from '../src/providers'
 
 const filename = fileURLToPath(import.meta.url)
 const dirname = path.dirname(filename)
@@ -50,8 +50,13 @@ const buildConfigWithSQLite = () => {
     plugins: [
       billingPlugin({
         providers: [
-          mollieProvider({
+          testProvider({
-            apiKey: process.env.MOLLIE_KEY!
+            enabled: true,
+            testModeIndicators: {
+              showWarningBanners: true,
+              showTestBadges: true,
+              consoleWarnings: true
+            }
           })
         ],
         collections: {

docs/test-provider-example.md

@@ -0,0 +1,147 @@
+# Advanced Test Provider Example
+
+The advanced test provider allows you to test complex payment scenarios with an interactive UI for development purposes.
+
+## Basic Configuration
+
+```typescript
+import { billingPlugin, testProvider } from '@xtr-dev/payload-billing'
+
+// Configure the test provider
+const testProviderConfig = {
+  enabled: true, // Enable the test provider
+  defaultDelay: 2000, // Default delay in milliseconds
+  baseUrl: process.env.PAYLOAD_PUBLIC_SERVER_URL || 'http://localhost:3000',
+  customUiRoute: '/test-payment', // Custom route for test payment UI
+  testModeIndicators: {
+    showWarningBanners: true, // Show warning banners in test mode
+    showTestBadges: true, // Show test badges
+    consoleWarnings: true, // Show console warnings
+  }
+}
+
+// Add to your payload config
+export default buildConfig({
+  plugins: [
+    billingPlugin({
+      providers: [
+        testProvider(testProviderConfig)
+      ]
+    })
+  ]
+})
+```
+
+## Custom Scenarios
+
+You can define custom payment scenarios:
+
+```typescript
+const customScenarios = [
+  {
+    id: 'quick-success',
+    name: 'Quick Success',
+    description: 'Payment succeeds in 1 second',
+    outcome: 'paid' as const,
+    delay: 1000,
+    method: 'creditcard' as const
+  },
+  {
+    id: 'network-timeout',
+    name: 'Network Timeout',
+    description: 'Simulates network timeout',
+    outcome: 'failed' as const,
+    delay: 10000
+  },
+  {
+    id: 'user-abandonment',
+    name: 'User Abandonment',
+    description: 'User closes payment window',
+    outcome: 'cancelled' as const,
+    delay: 5000
+  }
+]
+
+const testProviderConfig = {
+  enabled: true,
+  scenarios: customScenarios,
+  // ... other config
+}
+```
+
+## Available Payment Outcomes
+
+- `paid` - Payment succeeds
+- `failed` - Payment fails
+- `cancelled` - Payment is cancelled by user
+- `expired` - Payment expires
+- `pending` - Payment remains pending
+
+## Available Payment Methods
+
+- `ideal` - iDEAL (Dutch banking)
+- `creditcard` - Credit/Debit Cards
+- `paypal` - PayPal
+- `applepay` - Apple Pay
+- `banktransfer` - Bank Transfer
+
+## Using the Test UI
+
+1. Create a payment using the test provider
+2. The payment will return a `paymentUrl` in the provider data
+3. Navigate to this URL to access the interactive test interface
+4. Select a payment method and scenario
+5. Click "Process Test Payment" to simulate the payment
+6. The payment status will update automatically based on the selected scenario
+
+## React Components
+
+Use the provided React components in your admin interface:
+
+```tsx
+import { TestModeWarningBanner, TestModeBadge, TestPaymentControls } from '@xtr-dev/payload-billing/client'
+
+// Show warning banner when in test mode
+<TestModeWarningBanner visible={isTestMode} />
+
+// Add test badge to payment status
+<div>
+  Payment Status: {status}
+  <TestModeBadge visible={isTestMode} />
+</div>
+
+// Payment testing controls
+<TestPaymentControls
+  paymentId={paymentId}
+  onScenarioSelect={(scenario) => console.log('Selected scenario:', scenario)}
+  onMethodSelect={(method) => console.log('Selected method:', method)}
+/>
+```
+
+## API Endpoints
+
+The test provider automatically registers these endpoints:
+
+- `GET /api/payload-billing/test/payment/:id` - Test payment UI
+- `POST /api/payload-billing/test/process` - Process test payment
+- `GET /api/payload-billing/test/status/:id` - Get payment status
+
+## Development Tips
+
+1. **Console Warnings**: Keep `consoleWarnings: true` to get notifications about test mode
+2. **Visual Indicators**: Use warning banners and badges to clearly mark test payments
+3. **Custom Scenarios**: Create scenarios that match your specific use cases
+4. **Automated Testing**: Use the test provider in your e2e tests for predictable payment outcomes
+5. **Method Testing**: Test different payment methods to ensure your UI handles them correctly
+
+## Production Safety
+
+The test provider includes several safety mechanisms:
+
+- Must be explicitly enabled with `enabled: true`
+- Clearly marked with test indicators
+- Console warnings when active
+- Separate endpoint namespace (`/payload-billing/test/`)
+- No real payment processing
+
+**Important**: Never use the test provider in production environments!

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@xtr-dev/payload-billing",
-  "version": "0.1.6",
+  "version": "0.1.8",
   "description": "PayloadCMS plugin for billing and payment provider integrations with tracking and local testing",
   "license": "MIT",
   "type": "module",

src/collections/hooks.ts

@@ -1,6 +1,6 @@
-import type { Payment } from '../plugin/types/index.js'
+import type { Payment } from '../plugin/types/index'
 import type { Payload } from 'payload'
-import { useBillingPlugin } from '../plugin/index.js'
+import { useBillingPlugin } from '../plugin/index'
 
 export const initProviderPayment = (payload: Payload, payment: Partial<Payment>) => {
   const billing = useBillingPlugin(payload)

src/collections/index.ts

@@ -1,3 +1,3 @@
-export { createInvoicesCollection } from './invoices.js'
+export { createInvoicesCollection } from './invoices'
-export { createPaymentsCollection } from './payments.js'
+export { createPaymentsCollection } from './payments'
-export { createRefundsCollection } from './refunds.js'
+export { createRefundsCollection } from './refunds'

src/collections/invoices.ts

@@ -5,10 +5,10 @@ import {
   CollectionBeforeValidateHook,
   CollectionConfig, Field,
 } from 'payload'
-import type { BillingPluginConfig} from '../plugin/config.js';
+import type { BillingPluginConfig} from '../plugin/config';
-import { defaults } from '../plugin/config.js'
+import { defaults } from '../plugin/config'
-import { extractSlug } from '../plugin/utils.js'
+import { extractSlug } from '../plugin/utils'
-import type { Invoice } from '../plugin/types/invoices.js'
+import type { Invoice } from '../plugin/types/invoices'
 
 export function createInvoicesCollection(pluginConfig: BillingPluginConfig): CollectionConfig {
   const {customerRelationSlug, customerInfoExtractor} = pluginConfig

src/collections/payments.ts

@@ -1,9 +1,9 @@
 import type { AccessArgs, CollectionBeforeChangeHook, CollectionConfig, Field } from 'payload'
-import type { BillingPluginConfig} from '../plugin/config.js';
+import type { BillingPluginConfig} from '../plugin/config';
-import { defaults } from '../plugin/config.js'
+import { defaults } from '../plugin/config'
-import { extractSlug } from '../plugin/utils.js'
+import { extractSlug } from '../plugin/utils'
-import type { Payment } from '../plugin/types/payments.js'
+import type { Payment } from '../plugin/types/payments'
-import { initProviderPayment } from './hooks.js'
+import { initProviderPayment } from './hooks'
 
 export function createPaymentsCollection(pluginConfig: BillingPluginConfig): CollectionConfig {
   const overrides = typeof pluginConfig.collections?.payments === 'object' ? pluginConfig.collections?.payments : {}

src/collections/refunds.ts

@@ -1,7 +1,7 @@
 import type { AccessArgs, CollectionConfig } from 'payload'
-import { BillingPluginConfig, defaults } from '../plugin/config.js'
+import { BillingPluginConfig, defaults } from '../plugin/config'
-import { extractSlug } from '../plugin/utils.js'
+import { extractSlug } from '../plugin/utils'
-import { Payment } from '../plugin/types/index.js'
+import { Payment } from '../plugin/types/index'
 
 export function createRefundsCollection(pluginConfig: BillingPluginConfig): CollectionConfig {
   // TODO: finish collection overrides

src/exports/client.tsx

@@ -60,9 +60,130 @@ export const PaymentStatusBadge: React.FC<{ status: string }> = ({ status }) =>
   )
 }
 
+// Test mode indicator components
+export const TestModeWarningBanner: React.FC<{ visible?: boolean }> = ({ visible = true }) => {
+  if (!visible) return null
+
+  return (
+    <div style={{
+      background: 'linear-gradient(90deg, #ff6b6b, #ffa726)',
+      color: 'white',
+      padding: '12px 20px',
+      textAlign: 'center',
+      fontWeight: 600,
+      fontSize: '14px',
+      marginBottom: '20px',
+      borderRadius: '4px'
+    }}>
+      🧪 TEST MODE - Payment system is running in test mode for development
+    </div>
+  )
+}
+
+export const TestModeBadge: React.FC<{ visible?: boolean }> = ({ visible = true }) => {
+  if (!visible) return null
+
+  return (
+    <span style={{
+      display: 'inline-block',
+      background: '#6c757d',
+      color: 'white',
+      padding: '4px 8px',
+      borderRadius: '4px',
+      fontSize: '12px',
+      fontWeight: 600,
+      textTransform: 'uppercase',
+      marginLeft: '8px'
+    }}>
+      Test
+    </span>
+  )
+}
+
+export const TestPaymentControls: React.FC<{
+  paymentId?: string
+  onScenarioSelect?: (scenario: string) => void
+  onMethodSelect?: (method: string) => void
+}> = ({ paymentId, onScenarioSelect, onMethodSelect }) => {
+  const [selectedScenario, setSelectedScenario] = React.useState('')
+  const [selectedMethod, setSelectedMethod] = React.useState('')
+
+  const scenarios = [
+    { id: 'instant-success', name: 'Instant Success', description: 'Payment succeeds immediately' },
+    { id: 'delayed-success', name: 'Delayed Success', description: 'Payment succeeds after delay' },
+    { id: 'cancelled-payment', name: 'Cancelled Payment', description: 'User cancels payment' },
+    { id: 'declined-payment', name: 'Declined Payment', description: 'Payment declined' },
+    { id: 'expired-payment', name: 'Expired Payment', description: 'Payment expires' },
+    { id: 'pending-payment', name: 'Pending Payment', description: 'Payment stays pending' }
+  ]
+
+  const methods = [
+    { id: 'ideal', name: 'iDEAL', icon: '🏦' },
+    { id: 'creditcard', name: 'Credit Card', icon: '💳' },
+    { id: 'paypal', name: 'PayPal', icon: '🅿️' },
+    { id: 'applepay', name: 'Apple Pay', icon: '🍎' },
+    { id: 'banktransfer', name: 'Bank Transfer', icon: '🏛️' }
+  ]
+
+  return (
+    <div style={{ border: '1px solid #e9ecef', borderRadius: '8px', padding: '16px', margin: '16px 0' }}>
+      <h4 style={{ marginBottom: '12px', color: '#2c3e50' }}>🧪 Test Payment Controls</h4>
+
+      <div style={{ marginBottom: '16px' }}>
+        <label style={{ display: 'block', marginBottom: '8px', fontWeight: '600' }}>Payment Method:</label>
+        <select
+          value={selectedMethod}
+          onChange={(e) => {
+            setSelectedMethod(e.target.value)
+            onMethodSelect?.(e.target.value)
+          }}
+          style={{ width: '100%', padding: '8px', borderRadius: '4px', border: '1px solid #ccc' }}
+        >
+          <option value="">Select payment method...</option>
+          {methods.map(method => (
+            <option key={method.id} value={method.id}>
+              {method.icon} {method.name}
+            </option>
+          ))}
+        </select>
+      </div>
+
+      <div style={{ marginBottom: '16px' }}>
+        <label style={{ display: 'block', marginBottom: '8px', fontWeight: '600' }}>Test Scenario:</label>
+        <select
+          value={selectedScenario}
+          onChange={(e) => {
+            setSelectedScenario(e.target.value)
+            onScenarioSelect?.(e.target.value)
+          }}
+          style={{ width: '100%', padding: '8px', borderRadius: '4px', border: '1px solid #ccc' }}
+        >
+          <option value="">Select test scenario...</option>
+          {scenarios.map(scenario => (
+            <option key={scenario.id} value={scenario.id}>
+              {scenario.name} - {scenario.description}
+            </option>
+          ))}
+        </select>
+      </div>
+
+      {paymentId && (
+        <div style={{ marginTop: '12px', padding: '8px', background: '#f8f9fa', borderRadius: '4px' }}>
+          <small style={{ color: '#6c757d' }}>
+            Payment ID: <code>{paymentId}</code>
+          </small>
+        </div>
+      )}
+    </div>
+  )
+}
+
 export default {
   BillingDashboardWidget,
   formatCurrency,
   getPaymentStatusColor,
   PaymentStatusBadge,
+  TestModeWarningBanner,
+  TestModeBadge,
+  TestPaymentControls,
 }

src/index.ts

@@ -1,8 +1,18 @@
 
 export { billingPlugin } from './plugin/index.js'
 export { mollieProvider, stripeProvider } from './providers/index.js'
-export type { BillingPluginConfig, CustomerInfoExtractor } from './plugin/config.js'
+export type { BillingPluginConfig, CustomerInfoExtractor, AdvancedTestProviderConfig } from './plugin/config.js'
 export type { Invoice, Payment, Refund } from './plugin/types/index.js'
 export type { PaymentProvider, ProviderData } from './providers/types.js'
-export type { MollieProviderConfig } from './providers/mollie.js'
+
-export type { StripeProviderConfig } from './providers/stripe.js'
+// Export all providers
+export { testProvider } from './providers/test.js'
+export type {
+  StripeProviderConfig,
+  MollieProviderConfig,
+  TestProviderConfig,
+  TestProviderConfigResponse,
+  PaymentOutcome,
+  PaymentMethod,
+  PaymentScenario
+} from './providers/index.js'

src/plugin/config.ts

@@ -1,6 +1,6 @@
 import { CollectionConfig } from 'payload'
-import { FieldsOverride } from './utils.js'
+import { FieldsOverride } from './utils'
-import { PaymentProvider } from './types/index.js'
+import { PaymentProvider } from './types/index'
 
 export const defaults = {
   paymentsCollection: 'payments',
@@ -19,6 +19,9 @@ export interface TestProviderConfig {
   simulateFailures?: boolean
 }
 
+// Re-export the actual test provider config instead of duplicating
+export type { TestProviderConfig as AdvancedTestProviderConfig } from '../providers/test'
+
 // Customer info extractor callback type
 export interface CustomerInfoExtractor {
   (customer: any): {

src/plugin/index.ts

@@ -1,8 +1,8 @@
-import { createInvoicesCollection, createPaymentsCollection, createRefundsCollection } from '../collections/index.js'
+import { createInvoicesCollection, createPaymentsCollection, createRefundsCollection } from '../collections/index'
-import type { BillingPluginConfig } from './config.js'
+import type { BillingPluginConfig } from './config'
 import type { Config, Payload } from 'payload'
-import { createSingleton } from './singleton.js'
+import { createSingleton } from './singleton'
-import type { PaymentProvider } from '../providers/index.js'
+import type { PaymentProvider } from '../providers/index'
 
 const singleton = createSingleton(Symbol('billingPlugin'))
 

src/plugin/types/invoices.ts

@@ -1,5 +1,5 @@
-import { Payment } from './payments.js'
+import { Payment } from './payments'
-import { Id } from './id.js'
+import { Id } from './id'
 
 export interface Invoice<TCustomer = unknown> {
   id: Id;

src/plugin/types/payments.ts

@@ -1,6 +1,6 @@
-import { Refund } from './refunds.js'
+import { Refund } from './refunds'
-import { Invoice } from './invoices.js'
+import { Invoice } from './invoices'
-import { Id } from './id.js'
+import { Id } from './id'
 
 export interface Payment {
   id: Id;

src/plugin/types/refunds.ts

@@ -1,4 +1,4 @@
-import { Payment } from './payments.js'
+import { Payment } from './payments'
 
 export interface Refund {
   id: number;

src/plugin/utils.ts

@@ -1,5 +1,5 @@
 import type { CollectionConfig, CollectionSlug, Field } from 'payload'
-import type { Id } from './types/index.js'
+import type { Id } from './types/index'
 
 export type FieldsOverride = (args: { defaultFields: Field[] }) => Field[]
 

src/providers/index.ts

@@ -1,4 +1,10 @@
-export * from './mollie.js'
+export * from './mollie'
-export * from './stripe.js'
+export * from './stripe'
-export * from './types.js'
+export * from './test'
-export * from './currency.js'
+export * from './types'
+export * from './currency'
+
+// Re-export provider configurations and types
+export type { StripeProviderConfig } from './stripe'
+export type { MollieProviderConfig } from './mollie'
+export type { TestProviderConfig, TestProviderConfigResponse, PaymentOutcome, PaymentMethod, PaymentScenario } from './test'

src/providers/mollie.ts

@@ -1,7 +1,7 @@
-import type { Payment } from '../plugin/types/payments.js'
+import type { Payment } from '../plugin/types/payments'
-import type { PaymentProvider } from '../plugin/types/index.js'
+import type { PaymentProvider } from '../plugin/types/index'
 import type { Payload } from 'payload'
-import { createSingleton } from '../plugin/singleton.js'
+import { createSingleton } from '../plugin/singleton'
 import type { createMollieClient, MollieClient } from '@mollie/api-client'
 import {
   webhookResponses,
@@ -10,8 +10,8 @@ import {
   updateInvoiceOnPaymentSuccess,
   handleWebhookError,
   validateProductionUrl
-} from './utils.js'
+} from './utils'
-import { formatAmountForProvider, isValidAmount, isValidCurrencyCode } from './currency.js'
+import { formatAmountForProvider, isValidAmount, isValidCurrencyCode } from './currency'
 
 const symbol = Symbol('mollie')
 export type MollieProviderConfig = Parameters<typeof createMollieClient>[0]

src/providers/stripe.ts

@@ -1,7 +1,7 @@
-import type { Payment } from '../plugin/types/payments.js'
+import type { Payment } from '../plugin/types/payments'
-import type { PaymentProvider, ProviderData } from '../plugin/types/index.js'
+import type { PaymentProvider, ProviderData } from '../plugin/types/index'
 import type { Payload } from 'payload'
-import { createSingleton } from '../plugin/singleton.js'
+import { createSingleton } from '../plugin/singleton'
 import type Stripe from 'stripe'
 import {
   webhookResponses,
@@ -10,8 +10,8 @@ import {
   updateInvoiceOnPaymentSuccess,
   handleWebhookError,
   logWebhookEvent
-} from './utils.js'
+} from './utils'
-import { isValidAmount, isValidCurrencyCode } from './currency.js'
+import { isValidAmount, isValidCurrencyCode } from './currency'
 
 const symbol = Symbol('stripe')
 

src/providers/test.ts

@@ -0,0 +1,801 @@
+import type { Payment } from '../plugin/types/payments'
+import type { PaymentProvider, ProviderData } from '../plugin/types/index'
+import type { BillingPluginConfig } from '../plugin/config'
+import type { Payload } from 'payload'
+import { handleWebhookError, logWebhookEvent } from './utils'
+import { isValidAmount, isValidCurrencyCode } from './currency'
+
+export type PaymentOutcome = 'paid' | 'failed' | 'cancelled' | 'expired' | 'pending'
+
+export type PaymentMethod = 'ideal' | 'creditcard' | 'paypal' | 'applepay' | 'banktransfer'
+
+export interface PaymentScenario {
+  id: string
+  name: string
+  description: string
+  outcome: PaymentOutcome
+  delay?: number // Delay in milliseconds before processing
+  method?: PaymentMethod
+}
+
+export interface TestProviderConfig {
+  enabled: boolean
+  scenarios?: PaymentScenario[]
+  customUiRoute?: string
+  testModeIndicators?: {
+    showWarningBanners?: boolean
+    showTestBadges?: boolean
+    consoleWarnings?: boolean
+  }
+  defaultDelay?: number
+  baseUrl?: string
+}
+
+export interface TestProviderConfigResponse {
+  enabled: boolean
+  scenarios: PaymentScenario[]
+  methods: Array<{
+    id: string
+    name: string
+    icon: string
+  }>
+  testModeIndicators: {
+    showWarningBanners: boolean
+    showTestBadges: boolean
+    consoleWarnings: boolean
+  }
+  defaultDelay: number
+  customUiRoute: string
+}
+
+// Properly typed session interface
+export interface TestPaymentSession {
+  id: string
+  payment: Partial<Payment>
+  scenario?: PaymentScenario
+  method?: PaymentMethod
+  createdAt: Date
+  status: PaymentOutcome
+}
+
+// Use the proper BillingPluginConfig type
+
+// Default payment scenarios
+const DEFAULT_SCENARIOS: PaymentScenario[] = [
+  {
+    id: 'instant-success',
+    name: 'Instant Success',
+    description: 'Payment succeeds immediately',
+    outcome: 'paid',
+    delay: 0
+  },
+  {
+    id: 'delayed-success',
+    name: 'Delayed Success',
+    description: 'Payment succeeds after a delay',
+    outcome: 'paid',
+    delay: 3000
+  },
+  {
+    id: 'cancelled-payment',
+    name: 'Cancelled Payment',
+    description: 'User cancels the payment',
+    outcome: 'cancelled',
+    delay: 1000
+  },
+  {
+    id: 'declined-payment',
+    name: 'Declined Payment',
+    description: 'Payment is declined by the provider',
+    outcome: 'failed',
+    delay: 2000
+  },
+  {
+    id: 'expired-payment',
+    name: 'Expired Payment',
+    description: 'Payment expires before completion',
+    outcome: 'expired',
+    delay: 5000
+  },
+  {
+    id: 'pending-payment',
+    name: 'Pending Payment',
+    description: 'Payment remains in pending state',
+    outcome: 'pending',
+    delay: 1500
+  }
+]
+
+// Payment method configurations
+const PAYMENT_METHODS: Record<PaymentMethod, { name: string; icon: string }> = {
+  ideal: { name: 'iDEAL', icon: '🏦' },
+  creditcard: { name: 'Credit Card', icon: '💳' },
+  paypal: { name: 'PayPal', icon: '🅿️' },
+  applepay: { name: 'Apple Pay', icon: '🍎' },
+  banktransfer: { name: 'Bank Transfer', icon: '🏛️' }
+}
+
+// In-memory storage for test payment sessions
+const testPaymentSessions = new Map<string, TestPaymentSession>()
+
+export const testProvider = (testConfig: TestProviderConfig) => {
+  if (!testConfig.enabled) {
+    throw new Error('Test provider is disabled')
+  }
+
+  const scenarios = testConfig.scenarios || DEFAULT_SCENARIOS
+  const baseUrl = testConfig.baseUrl || (process.env.PAYLOAD_PUBLIC_SERVER_URL || 'http://localhost:3000')
+  const uiRoute = testConfig.customUiRoute || '/test-payment'
+
+  // Log test mode warnings if enabled
+  if (testConfig.testModeIndicators?.consoleWarnings !== false) {
+    console.warn('🧪 [TEST PROVIDER] Payment system is running in test mode')
+  }
+
+  return {
+    key: 'test',
+    onConfig: (config, pluginConfig) => {
+      // Register test payment UI endpoint
+      config.endpoints = [
+        ...(config.endpoints || []),
+        {
+          path: '/payload-billing/test/payment/:id',
+          method: 'get',
+          handler: async (req) => {
+            // Extract payment ID from URL path
+            const urlParts = req.url?.split('/') || []
+            const paymentId = urlParts[urlParts.length - 1]
+            if (!paymentId) {
+              return new Response('Payment ID required', { status: 400 })
+            }
+
+            const session = testPaymentSessions.get(paymentId)
+            if (!session) {
+              return new Response('Payment session not found', { status: 404 })
+            }
+
+            // Generate test payment UI
+            const html = generateTestPaymentUI(session, scenarios, uiRoute, baseUrl, testConfig)
+            return new Response(html, {
+              headers: { 'Content-Type': 'text/html' }
+            })
+          }
+        },
+        {
+          path: '/payload-billing/test/config',
+          method: 'get',
+          handler: async (req) => {
+            const response: TestProviderConfigResponse = {
+              enabled: testConfig.enabled,
+              scenarios: scenarios,
+              methods: Object.entries(PAYMENT_METHODS).map(([id, method]) => ({
+                id,
+                name: method.name,
+                icon: method.icon
+              })),
+              testModeIndicators: testConfig.testModeIndicators || {
+                showWarningBanners: true,
+                showTestBadges: true,
+                consoleWarnings: true
+              },
+              defaultDelay: testConfig.defaultDelay || 1000,
+              customUiRoute: uiRoute
+            }
+            return new Response(JSON.stringify(response), {
+              headers: { 'Content-Type': 'application/json' }
+            })
+          }
+        },
+        {
+          path: '/payload-billing/test/process',
+          method: 'post',
+          handler: async (req) => {
+            try {
+              const payload = req.payload
+              const body = await req.json?.() || {}
+              const { paymentId, scenarioId, method } = body as any
+
+              const session = testPaymentSessions.get(paymentId)
+              if (!session) {
+                return new Response(JSON.stringify({ error: 'Payment session not found' }), {
+                  status: 404,
+                  headers: { 'Content-Type': 'application/json' }
+                })
+              }
+
+              const scenario = scenarios.find(s => s.id === scenarioId)
+              if (!scenario) {
+                return new Response(JSON.stringify({ error: 'Invalid scenario' }), {
+                  status: 400,
+                  headers: { 'Content-Type': 'application/json' }
+                })
+              }
+
+              // Update session with selected scenario and method
+              session.scenario = scenario
+              session.method = method
+              session.status = 'pending'
+
+              // Process payment after delay
+              setTimeout(() => {
+                processTestPayment(payload, session, pluginConfig).catch(async (error) => {
+                  console.error('[Test Provider] Failed to process payment:', error)
+                  session.status = 'failed'
+
+                  // Also update the payment record in database
+                  try {
+                    const paymentsCollection = (typeof pluginConfig.collections?.payments === 'string'
+                      ? pluginConfig.collections.payments
+                      : 'payments') as any
+                    const payments = await payload.find({
+                      collection: paymentsCollection,
+                      where: { providerId: { equals: session.id } },
+                      limit: 1
+                    })
+
+                    if (payments.docs.length > 0) {
+                      await payload.update({
+                        collection: paymentsCollection,
+                        id: payments.docs[0].id,
+                        data: {
+                          status: 'failed',
+                          providerData: {
+                            raw: { error: error.message, processedAt: new Date().toISOString() },
+                            timestamp: new Date().toISOString(),
+                            provider: 'test'
+                          }
+                        }
+                      })
+                    }
+                  } catch (dbError) {
+                    console.error('[Test Provider] Failed to update payment in database:', dbError)
+                  }
+                })
+              }, scenario.delay || testConfig.defaultDelay || 1000)
+
+              return new Response(JSON.stringify({
+                success: true,
+                status: 'processing',
+                scenario: scenario.name,
+                delay: scenario.delay || testConfig.defaultDelay || 1000
+              }), {
+                headers: { 'Content-Type': 'application/json' }
+              })
+            } catch (error) {
+              return handleWebhookError('Test Provider', error, 'Failed to process test payment')
+            }
+          }
+        },
+        {
+          path: '/payload-billing/test/status/:id',
+          method: 'get',
+          handler: async (req) => {
+            // Extract payment ID from URL path
+            const urlParts = req.url?.split('/') || []
+            const paymentId = urlParts[urlParts.length - 1]
+            if (!paymentId) {
+              return new Response(JSON.stringify({ error: 'Payment ID required' }), {
+                status: 400,
+                headers: { 'Content-Type': 'application/json' }
+              })
+            }
+
+            const session = testPaymentSessions.get(paymentId)
+            if (!session) {
+              return new Response(JSON.stringify({ error: 'Payment session not found' }), {
+                status: 404,
+                headers: { 'Content-Type': 'application/json' }
+              })
+            }
+
+            return new Response(JSON.stringify({
+              status: session.status,
+              scenario: session.scenario?.name,
+              method: session.method ? PAYMENT_METHODS[session.method]?.name : undefined
+            }), {
+              headers: { 'Content-Type': 'application/json' }
+            })
+          }
+        }
+      ]
+    },
+    onInit: async (payload: Payload) => {
+      logWebhookEvent('Test Provider', 'Test payment provider initialized')
+
+      // Clean up old sessions periodically (older than 1 hour)
+      setInterval(() => {
+        const oneHourAgo = new Date(Date.now() - 60 * 60 * 1000)
+        testPaymentSessions.forEach((session, id) => {
+          if (session.createdAt < oneHourAgo) {
+            testPaymentSessions.delete(id)
+          }
+        })
+      }, 10 * 60 * 1000) // Clean every 10 minutes
+    },
+    initPayment: async (payload, payment) => {
+      // Validate required fields
+      if (!payment.amount) {
+        throw new Error('Amount is required')
+      }
+      if (!payment.currency) {
+        throw new Error('Currency is required')
+      }
+
+      // Validate amount
+      if (!isValidAmount(payment.amount)) {
+        throw new Error('Invalid amount: must be a positive integer within reasonable limits')
+      }
+
+      // Validate currency code
+      if (!isValidCurrencyCode(payment.currency)) {
+        throw new Error('Invalid currency: must be a 3-letter ISO code')
+      }
+
+      // Generate unique test payment ID
+      const testPaymentId = `test_pay_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`
+
+      // Create test payment session
+      const session = {
+        id: testPaymentId,
+        payment: { ...payment },
+        createdAt: new Date(),
+        status: 'pending' as PaymentOutcome
+      }
+
+      testPaymentSessions.set(testPaymentId, session)
+
+      // Set provider ID and data
+      payment.providerId = testPaymentId
+      const providerData: ProviderData = {
+        raw: {
+          id: testPaymentId,
+          amount: payment.amount,
+          currency: payment.currency,
+          description: payment.description,
+          status: 'pending',
+          testMode: true,
+          paymentUrl: `${baseUrl}/api/payload-billing/test/payment/${testPaymentId}`,
+          scenarios: scenarios.map(s => ({ id: s.id, name: s.name, description: s.description })),
+          methods: Object.entries(PAYMENT_METHODS).map(([key, value]) => ({
+            id: key,
+            name: value.name,
+            icon: value.icon
+          }))
+        },
+        timestamp: new Date().toISOString(),
+        provider: 'test'
+      }
+      payment.providerData = providerData
+
+      return payment
+    },
+  } satisfies PaymentProvider
+}
+
+// Helper function to process test payment based on scenario
+async function processTestPayment(
+  payload: Payload,
+  session: TestPaymentSession,
+  pluginConfig: BillingPluginConfig
+): Promise<void> {
+  try {
+    if (!session.scenario) return
+
+    // Map scenario outcome to payment status
+    let finalStatus: Payment['status'] = 'pending'
+    switch (session.scenario.outcome) {
+      case 'paid':
+        finalStatus = 'succeeded'
+        break
+      case 'failed':
+        finalStatus = 'failed'
+        break
+      case 'cancelled':
+        finalStatus = 'canceled'
+        break
+      case 'expired':
+        finalStatus = 'canceled' // Treat expired as canceled
+        break
+      case 'pending':
+        finalStatus = 'pending'
+        break
+    }
+
+    // Update session status
+    session.status = session.scenario.outcome
+
+    // Find and update the payment in the database
+    const paymentsCollection = (typeof pluginConfig.collections?.payments === 'string'
+      ? pluginConfig.collections.payments
+      : 'payments') as any
+    const payments = await payload.find({
+      collection: paymentsCollection,
+      where: {
+        providerId: {
+          equals: session.id
+        }
+      },
+      limit: 1
+    })
+
+    if (payments.docs.length > 0) {
+      const payment = payments.docs[0]
+
+      // Update payment with final status and provider data
+      const updatedProviderData: ProviderData = {
+        raw: {
+          ...session.payment,
+          id: session.id,
+          status: session.scenario.outcome,
+          scenario: session.scenario.name,
+          method: session.method,
+          processedAt: new Date().toISOString(),
+          testMode: true
+        },
+        timestamp: new Date().toISOString(),
+        provider: 'test'
+      }
+
+      await payload.update({
+        collection: paymentsCollection,
+        id: payment.id,
+        data: {
+          status: finalStatus,
+          providerData: updatedProviderData
+        }
+      })
+
+      logWebhookEvent('Test Provider', `Payment ${session.id} processed with outcome: ${session.scenario.outcome}`)
+    }
+  } catch (error) {
+    console.error('[Test Provider] Failed to process payment:', error)
+    session.status = 'failed'
+  }
+}
+
+// Helper function to generate test payment UI
+function generateTestPaymentUI(
+  session: TestPaymentSession,
+  scenarios: PaymentScenario[],
+  uiRoute: string,
+  baseUrl: string,
+  testConfig: TestProviderConfig
+): string {
+  const payment = session.payment
+  const testModeIndicators = testConfig.testModeIndicators || {}
+
+  return `<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Test Payment - ${payment.description || 'Payment'}</title>
+    <style>
+        * { box-sizing: border-box; margin: 0; padding: 0; }
+        body {
+            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
+            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+            min-height: 100vh;
+            padding: 20px;
+        }
+        .container {
+            max-width: 600px;
+            margin: 0 auto;
+            background: white;
+            border-radius: 12px;
+            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
+            overflow: hidden;
+        }
+        ${testModeIndicators.showWarningBanners !== false ? `
+        .test-banner {
+            background: linear-gradient(90deg, #ff6b6b, #ffa726);
+            color: white;
+            padding: 12px 20px;
+            text-align: center;
+            font-weight: 600;
+            font-size: 14px;
+        }
+        ` : ''}
+        .header {
+            background: #f8f9fa;
+            padding: 30px 40px 20px;
+            border-bottom: 1px solid #e9ecef;
+        }
+        .title {
+            font-size: 24px;
+            font-weight: 700;
+            color: #2c3e50;
+            margin-bottom: 8px;
+        }
+        .amount {
+            font-size: 32px;
+            font-weight: 800;
+            color: #27ae60;
+            margin-bottom: 16px;
+        }
+        .description {
+            color: #6c757d;
+            font-size: 16px;
+            line-height: 1.5;
+        }
+        .content { padding: 40px; }
+        .section { margin-bottom: 30px; }
+        .section-title {
+            font-size: 18px;
+            font-weight: 600;
+            color: #2c3e50;
+            margin-bottom: 16px;
+            display: flex;
+            align-items: center;
+            gap: 8px;
+        }
+        .payment-methods {
+            display: grid;
+            grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
+            gap: 12px;
+            margin-bottom: 20px;
+        }
+        .method {
+            border: 2px solid #e9ecef;
+            border-radius: 8px;
+            padding: 16px 12px;
+            text-align: center;
+            cursor: pointer;
+            transition: all 0.2s;
+            background: white;
+        }
+        .method:hover {
+            border-color: #007bff;
+            background: #f8f9ff;
+        }
+        .method.selected {
+            border-color: #007bff;
+            background: #007bff;
+            color: white;
+        }
+        .method-icon { font-size: 24px; margin-bottom: 8px; }
+        .method-name { font-size: 12px; font-weight: 500; }
+        .scenarios {
+            display: grid;
+            gap: 12px;
+            margin-bottom: 20px;
+        }
+        .scenario {
+            border: 2px solid #e9ecef;
+            border-radius: 8px;
+            padding: 16px;
+            cursor: pointer;
+            transition: all 0.2s;
+            background: white;
+        }
+        .scenario:hover {
+            border-color: #28a745;
+            background: #f8fff9;
+        }
+        .scenario.selected {
+            border-color: #28a745;
+            background: #28a745;
+            color: white;
+        }
+        .scenario-name { font-weight: 600; margin-bottom: 4px; }
+        .scenario-desc { font-size: 14px; opacity: 0.8; }
+        .process-btn {
+            width: 100%;
+            background: linear-gradient(135deg, #007bff, #0056b3);
+            color: white;
+            border: none;
+            padding: 16px;
+            border-radius: 8px;
+            font-size: 16px;
+            font-weight: 600;
+            cursor: pointer;
+            transition: all 0.2s;
+            margin-top: 20px;
+        }
+        .process-btn:hover:not(:disabled) {
+            transform: translateY(-2px);
+            box-shadow: 0 8px 20px rgba(0,123,255,0.3);
+        }
+        .process-btn:disabled {
+            opacity: 0.6;
+            cursor: not-allowed;
+            transform: none;
+        }
+        .status {
+            text-align: center;
+            padding: 20px;
+            border-radius: 8px;
+            margin-top: 20px;
+            font-weight: 600;
+        }
+        .status.processing { background: #fff3cd; color: #856404; }
+        .status.success { background: #d4edda; color: #155724; }
+        .status.error { background: #f8d7da; color: #721c24; }
+        .loading {
+            display: inline-block;
+            width: 20px;
+            height: 20px;
+            border: 3px solid #f3f3f3;
+            border-top: 3px solid #007bff;
+            border-radius: 50%;
+            animation: spin 1s linear infinite;
+            margin-right: 10px;
+        }
+        @keyframes spin {
+            0% { transform: rotate(0deg); }
+            100% { transform: rotate(360deg); }
+        }
+        ${testModeIndicators.showTestBadges !== false ? `
+        .test-badge {
+            display: inline-block;
+            background: #6c757d;
+            color: white;
+            padding: 4px 8px;
+            border-radius: 4px;
+            font-size: 12px;
+            font-weight: 600;
+            text-transform: uppercase;
+            margin-left: 8px;
+        }
+        ` : ''}
+    </style>
+</head>
+<body>
+    <div class="container">
+        ${testModeIndicators.showWarningBanners !== false ? `
+        <div class="test-banner">
+            🧪 TEST MODE - This is a simulated payment for development purposes
+        </div>
+        ` : ''}
+
+        <div class="header">
+            <div class="title">
+                Test Payment Checkout
+                ${testModeIndicators.showTestBadges !== false ? '<span class="test-badge">Test</span>' : ''}
+            </div>
+            <div class="amount">${payment.currency?.toUpperCase()} ${payment.amount ? (payment.amount / 100).toFixed(2) : '0.00'}</div>
+            ${payment.description ? `<div class="description">${payment.description}</div>` : ''}
+        </div>
+
+        <div class="content">
+            <div class="section">
+                <div class="section-title">
+                    💳 Select Payment Method
+                </div>
+                <div class="payment-methods">
+                    ${Object.entries(PAYMENT_METHODS).map(([key, method]) => `
+                        <div class="method" data-method="${key}">
+                            <div class="method-icon">${method.icon}</div>
+                            <div class="method-name">${method.name}</div>
+                        </div>
+                    `).join('')}
+                </div>
+            </div>
+
+            <div class="section">
+                <div class="section-title">
+                    🎭 Select Test Scenario
+                </div>
+                <div class="scenarios">
+                    ${scenarios.map(scenario => `
+                        <div class="scenario" data-scenario="${scenario.id}">
+                            <div class="scenario-name">${scenario.name}</div>
+                            <div class="scenario-desc">${scenario.description}</div>
+                        </div>
+                    `).join('')}
+                </div>
+            </div>
+
+            <button class="process-btn" id="processBtn" disabled>
+                Process Test Payment
+            </button>
+
+            <div id="status" class="status" style="display: none;"></div>
+        </div>
+    </div>
+
+    <script>
+        let selectedMethod = null;
+        let selectedScenario = null;
+
+        // Payment method selection
+        document.querySelectorAll('.method').forEach(method => {
+            method.addEventListener('click', () => {
+                document.querySelectorAll('.method').forEach(m => m.classList.remove('selected'));
+                method.classList.add('selected');
+                selectedMethod = method.dataset.method;
+                updateProcessButton();
+            });
+        });
+
+        // Scenario selection
+        document.querySelectorAll('.scenario').forEach(scenario => {
+            scenario.addEventListener('click', () => {
+                document.querySelectorAll('.scenario').forEach(s => s.classList.remove('selected'));
+                scenario.classList.add('selected');
+                selectedScenario = scenario.dataset.scenario;
+                updateProcessButton();
+            });
+        });
+
+        function updateProcessButton() {
+            const btn = document.getElementById('processBtn');
+            btn.disabled = !selectedMethod || !selectedScenario;
+        }
+
+        // Process payment
+        document.getElementById('processBtn').addEventListener('click', async () => {
+            const btn = document.getElementById('processBtn');
+            const status = document.getElementById('status');
+
+            btn.disabled = true;
+            btn.innerHTML = '<span class="loading"></span>Processing...';
+
+            try {
+                const response = await fetch('/api/payload-billing/test/process', {
+                    method: 'POST',
+                    headers: { 'Content-Type': 'application/json' },
+                    body: JSON.stringify({
+                        paymentId: '${session.id}',
+                        scenarioId: selectedScenario,
+                        method: selectedMethod
+                    })
+                });
+
+                const result = await response.json();
+
+                if (result.success) {
+                    status.className = 'status processing';
+                    status.style.display = 'block';
+                    status.innerHTML = \`<span class="loading"></span>Processing payment with \${result.scenario}...\`;
+
+                    // Poll for status updates
+                    setTimeout(() => pollStatus(), result.delay || 1000);
+                } else {
+                    throw new Error(result.error || 'Failed to process payment');
+                }
+            } catch (error) {
+                status.className = 'status error';
+                status.style.display = 'block';
+                status.textContent = 'Error: ' + error.message;
+                btn.disabled = false;
+                btn.textContent = 'Process Test Payment';
+            }
+        });
+
+        async function pollStatus() {
+            try {
+                const response = await fetch('/api/payload-billing/test/status/${session.id}');
+                const result = await response.json();
+
+                const status = document.getElementById('status');
+                const btn = document.getElementById('processBtn');
+
+                if (result.status === 'paid') {
+                    status.className = 'status success';
+                    status.textContent = '✅ Payment successful!';
+                    setTimeout(() => {
+                        window.location.href = '${baseUrl}/success';
+                    }, 2000);
+                } else if (result.status === 'failed' || result.status === 'cancelled' || result.status === 'expired') {
+                    status.className = 'status error';
+                    status.textContent = \`❌ Payment \${result.status}\`;
+                    btn.disabled = false;
+                    btn.textContent = 'Try Again';
+                } else if (result.status === 'pending') {
+                    status.className = 'status processing';
+                    status.innerHTML = '<span class="loading"></span>Payment is still pending...';
+                    setTimeout(() => pollStatus(), 2000);
+                }
+            } catch (error) {
+                console.error('Failed to poll status:', error);
+            }
+        }
+
+        ${testModeIndicators.consoleWarnings !== false ? `
+        console.warn('🧪 TEST MODE: This is a simulated payment interface for development purposes');
+        ` : ''}
+    </script>
+</body>
+</html>`
+}

src/providers/types.ts

@@ -1,6 +1,6 @@
-import type { Payment } from '../plugin/types/payments.js'
+import type { Payment } from '../plugin/types/payments'
 import type { Config, Payload } from 'payload'
-import type { BillingPluginConfig } from '../plugin/config.js'
+import type { BillingPluginConfig } from '../plugin/config'
 
 export type InitPayment = (payload: Payload, payment: Partial<Payment>) => Promise<Partial<Payment>>
 

src/providers/utils.ts

@@ -1,9 +1,9 @@
 import type { Payload } from 'payload'
-import type { Payment } from '../plugin/types/payments.js'
+import type { Payment } from '../plugin/types/payments'
-import type { BillingPluginConfig } from '../plugin/config.js'
+import type { BillingPluginConfig } from '../plugin/config'
-import type { ProviderData } from './types.js'
+import type { ProviderData } from './types'
-import { defaults } from '../plugin/config.js'
+import { defaults } from '../plugin/config'
-import { extractSlug, toPayloadId } from '../plugin/utils.js'
+import { extractSlug, toPayloadId } from '../plugin/utils'
 
 /**
  * Common webhook response utilities