Add PayloadCMS type definitions, Prettier config, and PNPM lockfile

dev/.env.example

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+# PayloadCMS Configuration
+PAYLOAD_SECRET=your-secret-key-here
+
+# Database Configuration
+DATABASE_URI=mongodb://localhost:27017/payload-billing-dev
+
+# Payment Provider Configuration (Optional - for testing integrations)
+STRIPE_SECRET_KEY=sk_test_your_stripe_secret_key
+STRIPE_PUBLISHABLE_KEY=pk_test_your_stripe_publishable_key  
+STRIPE_WEBHOOK_SECRET=whsec_your_webhook_secret
+
+MOLLIE_API_KEY=test_your_mollie_api_key
+MOLLIE_WEBHOOK_URL=http://localhost:3000/api/billing/webhooks/mollie
+
+# Development Settings
+NODE_ENV=development

dev/app/(payload)/admin/[[...segments]]/not-found.tsx

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+/* THIS FILE WAS GENERATED AUTOMATICALLY BY PAYLOAD. */
+/* DO NOT MODIFY IT BECAUSE IT COULD BE REWRITTEN AT ANY TIME. */
+import type { Metadata } from 'next'
+
+import config from '@payload-config'
+import { generatePageMetadata, NotFoundPage } from '@payloadcms/next/views'
+
+import { importMap } from '../importMap.js'
+
+type Args = {
+  params: Promise<{
+    segments: string[]
+  }>
+  searchParams: Promise<{
+    [key: string]: string | string[]
+  }>
+}
+
+export const generateMetadata = ({ params, searchParams }: Args): Promise<Metadata> =>
+  generatePageMetadata({ config, params, searchParams })
+
+const NotFound = ({ params, searchParams }: Args) =>
+  NotFoundPage({ config, importMap, params, searchParams })
+
+export default NotFound

dev/app/(payload)/admin/[[...segments]]/page.tsx

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+/* THIS FILE WAS GENERATED AUTOMATICALLY BY PAYLOAD. */
+/* DO NOT MODIFY IT BECAUSE IT COULD BE REWRITTEN AT ANY TIME. */
+import type { Metadata } from 'next'
+
+import config from '@payload-config'
+import { generatePageMetadata, RootPage } from '@payloadcms/next/views'
+
+import { importMap } from '../importMap.js'
+
+type Args = {
+  params: Promise<{
+    segments: string[]
+  }>
+  searchParams: Promise<{
+    [key: string]: string | string[]
+  }>
+}
+
+export const generateMetadata = ({ params, searchParams }: Args): Promise<Metadata> =>
+  generatePageMetadata({ config, params, searchParams })
+
+const Page = ({ params, searchParams }: Args) =>
+  RootPage({ config, importMap, params, searchParams })
+
+export default Page

dev/app/(payload)/admin/importMap.js

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+
+
+export const importMap = {
+
+}

dev/app/(payload)/api/[...slug]/route.ts

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+/* THIS FILE WAS GENERATED AUTOMATICALLY BY PAYLOAD. */
+/* DO NOT MODIFY IT BECAUSE IT COULD BE REWRITTEN AT ANY TIME. */
+import config from '@payload-config'
+import '@payloadcms/next/css'
+import {
+  REST_DELETE,
+  REST_GET,
+  REST_OPTIONS,
+  REST_PATCH,
+  REST_POST,
+  REST_PUT,
+} from '@payloadcms/next/routes'
+
+export const GET = REST_GET(config)
+export const POST = REST_POST(config)
+export const DELETE = REST_DELETE(config)
+export const PATCH = REST_PATCH(config)
+export const PUT = REST_PUT(config)
+export const OPTIONS = REST_OPTIONS(config)

dev/app/(payload)/api/graphql-playground/route.ts

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+/* THIS FILE WAS GENERATED AUTOMATICALLY BY PAYLOAD. */
+/* DO NOT MODIFY IT BECAUSE IT COULD BE REWRITTEN AT ANY TIME. */
+import config from '@payload-config'
+import '@payloadcms/next/css'
+import { GRAPHQL_PLAYGROUND_GET } from '@payloadcms/next/routes'
+
+export const GET = GRAPHQL_PLAYGROUND_GET(config)

dev/app/(payload)/api/graphql/route.ts

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+/* THIS FILE WAS GENERATED AUTOMATICALLY BY PAYLOAD. */
+/* DO NOT MODIFY IT BECAUSE IT COULD BE REWRITTEN AT ANY TIME. */
+import config from '@payload-config'
+import { GRAPHQL_POST, REST_OPTIONS } from '@payloadcms/next/routes'
+
+export const POST = GRAPHQL_POST(config)
+
+export const OPTIONS = REST_OPTIONS(config)

dev/app/(payload)/layout.tsx

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+import type { ServerFunctionClient } from 'payload'
+
+import '@payloadcms/next/css'
+/* THIS FILE WAS GENERATED AUTOMATICALLY BY PAYLOAD. */
+/* DO NOT MODIFY IT BECAUSE IT COULD BE REWRITTEN AT ANY TIME. */
+import config from '@payload-config'
+import { handleServerFunctions, RootLayout } from '@payloadcms/next/layouts'
+import React from 'react'
+
+import { importMap } from './admin/importMap.js'
+import './custom.scss'
+
+type Args = {
+  children: React.ReactNode
+}
+
+const serverFunction: ServerFunctionClient = async function (args) {
+  'use server'
+  return handleServerFunctions({
+    ...args,
+    config,
+    importMap,
+  })
+}
+
+const Layout = ({ children }: Args) => (
+  <RootLayout config={config} importMap={importMap} serverFunction={serverFunction}>
+    {children}
+  </RootLayout>
+)
+
+export default Layout

dev/app/my-route/route.ts

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+import configPromise from '@payload-config'
+import { getPayload } from 'payload'
+
+export const GET = async (request: Request) => {
+  const payload = await getPayload({
+    config: configPromise,
+  })
+
+  return Response.json({
+    message: 'This is an example of a custom route.',
+  })
+}

dev/e2e.spec.ts

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+import { expect, test } from '@playwright/test'
+
+// this is an example Playwright e2e test
+test('should render admin panel logo', async ({ page }) => {
+  await page.goto('/admin')
+
+  // login
+  await page.fill('#field-email', 'dev@payloadcms.com')
+  await page.fill('#field-password', 'test')
+  await page.click('.form-submit button')
+
+  // should show dashboard
+  await expect(page).toHaveTitle(/Dashboard/)
+  await expect(page.locator('.graphic-icon')).toBeVisible()
+})

dev/helpers/credentials.ts

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+export const devUser = {
+  email: 'dev@payloadcms.com',
+  password: 'test',
+}

dev/helpers/testEmailAdapter.ts

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+import type { EmailAdapter, SendEmailOptions } from 'payload'
+
+/**
+ * Logs all emails to stdout
+ */
+export const testEmailAdapter: EmailAdapter<void> = ({ payload }) => ({
+  name: 'test-email-adapter',
+  defaultFromAddress: 'dev@payloadcms.com',
+  defaultFromName: 'Payload Test',
+  sendEmail: async (message) => {
+    const stringifiedTo = getStringifiedToAddress(message)
+    const res = `Test email to: '${stringifiedTo}', Subject: '${message.subject}'`
+    payload.logger.info({ content: message, msg: res })
+    return Promise.resolve()
+  },
+})
+
+function getStringifiedToAddress(message: SendEmailOptions): string | undefined {
+  let stringifiedTo: string | undefined
+
+  if (typeof message.to === 'string') {
+    stringifiedTo = message.to
+  } else if (Array.isArray(message.to)) {
+    stringifiedTo = message.to
+      .map((to: { address: string } | string) => {
+        if (typeof to === 'string') {
+          return to
+        } else if (to.address) {
+          return to.address
+        }
+        return ''
+      })
+      .join(', ')
+  } else if (message.to?.address) {
+    stringifiedTo = message.to.address
+  }
+  return stringifiedTo
+}

dev/int.spec.ts

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+import type { Payload } from 'payload'
+
+import config from '@payload-config'
+import { createPayloadRequest, getPayload } from 'payload'
+import { afterAll, beforeAll, describe, expect, test } from 'vitest'
+
+import { customEndpointHandler } from '../src/endpoints/customEndpointHandler.js'
+
+let payload: Payload
+
+afterAll(async () => {
+  await payload.destroy()
+})
+
+beforeAll(async () => {
+  payload = await getPayload({ config })
+})
+
+describe('Plugin integration tests', () => {
+  test('should query custom endpoint added by plugin', async () => {
+    const request = new Request('http://localhost:3000/api/my-plugin-endpoint', {
+      method: 'GET',
+    })
+
+    const payloadRequest = await createPayloadRequest({ config, request })
+    const response = await customEndpointHandler(payloadRequest)
+    expect(response.status).toBe(200)
+
+    const data = await response.json()
+    expect(data).toMatchObject({
+      message: 'Hello from custom endpoint',
+    })
+  })
+
+  test('can create post with custom text field added by plugin', async () => {
+    const post = await payload.create({
+      collection: 'posts',
+      data: {
+        addedByPlugin: 'added by plugin',
+      },
+    })
+    expect(post.addedByPlugin).toBe('added by plugin')
+  })
+
+  test('plugin creates and seeds plugin-collection', async () => {
+    expect(payload.collections['plugin-collection']).toBeDefined()
+
+    const { docs } = await payload.find({ collection: 'plugin-collection' })
+
+    expect(docs).toHaveLength(1)
+  })
+})

dev/next-env.d.ts

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+/// <reference types="next" />
+/// <reference types="next/image-types/global" />
+
+// NOTE: This file should not be edited
+// see https://nextjs.org/docs/app/api-reference/config/typescript for more information.

dev/next.config.mjs

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+import { withPayload } from '@payloadcms/next/withPayload'
+import { fileURLToPath } from 'url'
+import path from 'path'
+
+const dirname = path.dirname(fileURLToPath(import.meta.url))
+
+/** @type {import('next').NextConfig} */
+const nextConfig = {
+  webpack: (webpackConfig) => {
+    webpackConfig.resolve.extensionAlias = {
+      '.cjs': ['.cts', '.cjs'],
+      '.js': ['.ts', '.tsx', '.js', '.jsx'],
+      '.mjs': ['.mts', '.mjs'],
+    }
+
+    return webpackConfig
+  },
+  serverExternalPackages: ['mongodb-memory-server'],
+}
+
+export default withPayload(nextConfig, { devBundleServerPackages: false })

dev/payload-types.ts

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+/* tslint:disable */
+/* eslint-disable */
+/**
+ * This file was automatically generated by Payload.
+ * DO NOT MODIFY IT BY HAND. Instead, modify your source Payload config,
+ * and re-run `payload generate:types` to regenerate this file.
+ */
+
+/**
+ * Supported timezones in IANA format.
+ *
+ * This interface was referenced by `Config`'s JSON-Schema
+ * via the `definition` "supportedTimezones".
+ */
+export type SupportedTimezones =
+  | 'Pacific/Midway'
+  | 'Pacific/Niue'
+  | 'Pacific/Honolulu'
+  | 'Pacific/Rarotonga'
+  | 'America/Anchorage'
+  | 'Pacific/Gambier'
+  | 'America/Los_Angeles'
+  | 'America/Tijuana'
+  | 'America/Denver'
+  | 'America/Phoenix'
+  | 'America/Chicago'
+  | 'America/Guatemala'
+  | 'America/New_York'
+  | 'America/Bogota'
+  | 'America/Caracas'
+  | 'America/Santiago'
+  | 'America/Buenos_Aires'
+  | 'America/Sao_Paulo'
+  | 'Atlantic/South_Georgia'
+  | 'Atlantic/Azores'
+  | 'Atlantic/Cape_Verde'
+  | 'Europe/London'
+  | 'Europe/Berlin'
+  | 'Africa/Lagos'
+  | 'Europe/Athens'
+  | 'Africa/Cairo'
+  | 'Europe/Moscow'
+  | 'Asia/Riyadh'
+  | 'Asia/Dubai'
+  | 'Asia/Baku'
+  | 'Asia/Karachi'
+  | 'Asia/Tashkent'
+  | 'Asia/Calcutta'
+  | 'Asia/Dhaka'
+  | 'Asia/Almaty'
+  | 'Asia/Jakarta'
+  | 'Asia/Bangkok'
+  | 'Asia/Shanghai'
+  | 'Asia/Singapore'
+  | 'Asia/Tokyo'
+  | 'Asia/Seoul'
+  | 'Australia/Brisbane'
+  | 'Australia/Sydney'
+  | 'Pacific/Guam'
+  | 'Pacific/Noumea'
+  | 'Pacific/Auckland'
+  | 'Pacific/Fiji';
+
+export interface Config {
+  auth: {
+    users: UserAuthOperations;
+  };
+  blocks: {};
+  collections: {
+    posts: Post;
+    media: Media;
+    payments: Payment;
+    customers: Customer;
+    invoices: Invoice;
+    refunds: Refund;
+    users: User;
+    'payload-locked-documents': PayloadLockedDocument;
+    'payload-preferences': PayloadPreference;
+    'payload-migrations': PayloadMigration;
+  };
+  collectionsJoins: {};
+  collectionsSelect: {
+    posts: PostsSelect<false> | PostsSelect<true>;
+    media: MediaSelect<false> | MediaSelect<true>;
+    payments: PaymentsSelect<false> | PaymentsSelect<true>;
+    customers: CustomersSelect<false> | CustomersSelect<true>;
+    invoices: InvoicesSelect<false> | InvoicesSelect<true>;
+    refunds: RefundsSelect<false> | RefundsSelect<true>;
+    users: UsersSelect<false> | UsersSelect<true>;
+    'payload-locked-documents': PayloadLockedDocumentsSelect<false> | PayloadLockedDocumentsSelect<true>;
+    'payload-preferences': PayloadPreferencesSelect<false> | PayloadPreferencesSelect<true>;
+    'payload-migrations': PayloadMigrationsSelect<false> | PayloadMigrationsSelect<true>;
+  };
+  db: {
+    defaultIDType: string;
+  };
+  globals: {};
+  globalsSelect: {};
+  locale: null;
+  user: User & {
+    collection: 'users';
+  };
+  jobs: {
+    tasks: unknown;
+    workflows: unknown;
+  };
+}
+export interface UserAuthOperations {
+  forgotPassword: {
+    email: string;
+    password: string;
+  };
+  login: {
+    email: string;
+    password: string;
+  };
+  registerFirstUser: {
+    email: string;
+    password: string;
+  };
+  unlock: {
+    email: string;
+    password: string;
+  };
+}
+/**
+ * This interface was referenced by `Config`'s JSON-Schema
+ * via the `definition` "posts".
+ */
+export interface Post {
+  id: string;
+  updatedAt: string;
+  createdAt: string;
+}
+/**
+ * This interface was referenced by `Config`'s JSON-Schema
+ * via the `definition` "media".
+ */
+export interface Media {
+  id: string;
+  updatedAt: string;
+  createdAt: string;
+  url?: string | null;
+  thumbnailURL?: string | null;
+  filename?: string | null;
+  mimeType?: string | null;
+  filesize?: number | null;
+  width?: number | null;
+  height?: number | null;
+  focalX?: number | null;
+  focalY?: number | null;
+}
+/**
+ * This interface was referenced by `Config`'s JSON-Schema
+ * via the `definition` "payments".
+ */
+export interface Payment {
+  id: string;
+  provider: 'stripe' | 'mollie' | 'test';
+  /**
+   * The payment ID from the payment provider
+   */
+  providerId: string;
+  status: 'pending' | 'processing' | 'succeeded' | 'failed' | 'canceled' | 'refunded' | 'partially_refunded';
+  /**
+   * Amount in cents (e.g., 2000 = $20.00)
+   */
+  amount: number;
+  /**
+   * ISO 4217 currency code (e.g., USD, EUR)
+   */
+  currency: string;
+  /**
+   * Payment description
+   */
+  description?: string | null;
+  customer?: (string | null) | Customer;
+  invoice?: (string | null) | Invoice;
+  /**
+   * Additional metadata for the payment
+   */
+  metadata?:
+    | {
+        [k: string]: unknown;
+      }
+    | unknown[]
+    | string
+    | number
+    | boolean
+    | null;
+  /**
+   * Raw data from the payment provider
+   */
+  providerData?:
+    | {
+        [k: string]: unknown;
+      }
+    | unknown[]
+    | string
+    | number
+    | boolean
+    | null;
+  refunds?: (string | Refund)[] | null;
+  updatedAt: string;
+  createdAt: string;
+}
+/**
+ * This interface was referenced by `Config`'s JSON-Schema
+ * via the `definition` "customers".
+ */
+export interface Customer {
+  id: string;
+  /**
+   * Customer email address
+   */
+  email?: string | null;
+  /**
+   * Customer full name
+   */
+  name?: string | null;
+  /**
+   * Customer phone number
+   */
+  phone?: string | null;
+  address?: {
+    line1?: string | null;
+    line2?: string | null;
+    city?: string | null;
+    state?: string | null;
+    postal_code?: string | null;
+    /**
+     * ISO 3166-1 alpha-2 country code
+     */
+    country?: string | null;
+  };
+  /**
+   * Customer IDs from payment providers
+   */
+  providerIds?:
+    | {
+        [k: string]: unknown;
+      }
+    | unknown[]
+    | string
+    | number
+    | boolean
+    | null;
+  /**
+   * Additional customer metadata
+   */
+  metadata?:
+    | {
+        [k: string]: unknown;
+      }
+    | unknown[]
+    | string
+    | number
+    | boolean
+    | null;
+  /**
+   * Customer payments
+   */
+  payments?: (string | Payment)[] | null;
+  /**
+   * Customer invoices
+   */
+  invoices?: (string | Invoice)[] | null;
+  updatedAt: string;
+  createdAt: string;
+}
+/**
+ * This interface was referenced by `Config`'s JSON-Schema
+ * via the `definition` "invoices".
+ */
+export interface Invoice {
+  id: string;
+  /**
+   * Invoice number (e.g., INV-001)
+   */
+  number: string;
+  customer: string | Customer;
+  status: 'draft' | 'open' | 'paid' | 'void' | 'uncollectible';
+  /**
+   * ISO 4217 currency code (e.g., USD, EUR)
+   */
+  currency: string;
+  items: {
+    description: string;
+    quantity: number;
+    /**
+     * Amount in cents
+     */
+    unitAmount: number;
+    /**
+     * Calculated: quantity × unitAmount
+     */
+    totalAmount?: number | null;
+    id?: string | null;
+  }[];
+  /**
+   * Sum of all line items
+   */
+  subtotal?: number | null;
+  /**
+   * Tax amount in cents
+   */
+  taxAmount?: number | null;
+  /**
+   * Total amount (subtotal + tax)
+   */
+  amount?: number | null;
+  dueDate?: string | null;
+  paidAt?: string | null;
+  payment?: (string | null) | Payment;
+  /**
+   * Internal notes
+   */
+  notes?: string | null;
+  /**
+   * Additional invoice metadata
+   */
+  metadata?:
+    | {
+        [k: string]: unknown;
+      }
+    | unknown[]
+    | string
+    | number
+    | boolean
+    | null;
+  updatedAt: string;
+  createdAt: string;
+}
+/**
+ * This interface was referenced by `Config`'s JSON-Schema
+ * via the `definition` "refunds".
+ */
+export interface Refund {
+  id: string;
+  /**
+   * The refund ID from the payment provider
+   */
+  providerId: string;
+  payment: string | Payment;
+  status: 'pending' | 'processing' | 'succeeded' | 'failed' | 'canceled';
+  /**
+   * Refund amount in cents
+   */
+  amount: number;
+  /**
+   * ISO 4217 currency code (e.g., USD, EUR)
+   */
+  currency: string;
+  /**
+   * Reason for the refund
+   */
+  reason?: ('duplicate' | 'fraudulent' | 'requested_by_customer' | 'other') | null;
+  /**
+   * Additional details about the refund
+   */
+  description?: string | null;
+  /**
+   * Additional refund metadata
+   */
+  metadata?:
+    | {
+        [k: string]: unknown;
+      }
+    | unknown[]
+    | string
+    | number
+    | boolean
+    | null;
+  /**
+   * Raw data from the payment provider
+   */
+  providerData?:
+    | {
+        [k: string]: unknown;
+      }
+    | unknown[]
+    | string
+    | number
+    | boolean
+    | null;
+  updatedAt: string;
+  createdAt: string;
+}
+/**
+ * This interface was referenced by `Config`'s JSON-Schema
+ * via the `definition` "users".
+ */
+export interface User {
+  id: string;
+  updatedAt: string;
+  createdAt: string;
+  email: string;
+  resetPasswordToken?: string | null;
+  resetPasswordExpiration?: string | null;
+  salt?: string | null;
+  hash?: string | null;
+  loginAttempts?: number | null;
+  lockUntil?: string | null;
+  password?: string | null;
+}
+/**
+ * This interface was referenced by `Config`'s JSON-Schema
+ * via the `definition` "payload-locked-documents".
+ */
+export interface PayloadLockedDocument {
+  id: string;
+  document?:
+    | ({
+        relationTo: 'posts';
+        value: string | Post;
+      } | null)
+    | ({
+        relationTo: 'media';
+        value: string | Media;
+      } | null)
+    | ({
+        relationTo: 'payments';
+        value: string | Payment;
+      } | null)
+    | ({
+        relationTo: 'customers';
+        value: string | Customer;
+      } | null)
+    | ({
+        relationTo: 'invoices';
+        value: string | Invoice;
+      } | null)
+    | ({
+        relationTo: 'refunds';
+        value: string | Refund;
+      } | null)
+    | ({
+        relationTo: 'users';
+        value: string | User;
+      } | null);
+  globalSlug?: string | null;
+  user: {
+    relationTo: 'users';
+    value: string | User;
+  };
+  updatedAt: string;
+  createdAt: string;
+}
+/**
+ * This interface was referenced by `Config`'s JSON-Schema
+ * via the `definition` "payload-preferences".
+ */
+export interface PayloadPreference {
+  id: string;
+  user: {
+    relationTo: 'users';
+    value: string | User;
+  };
+  key?: string | null;
+  value?:
+    | {
+        [k: string]: unknown;
+      }
+    | unknown[]
+    | string
+    | number
+    | boolean
+    | null;
+  updatedAt: string;
+  createdAt: string;
+}
+/**
+ * This interface was referenced by `Config`'s JSON-Schema
+ * via the `definition` "payload-migrations".
+ */
+export interface PayloadMigration {
+  id: string;
+  name?: string | null;
+  batch?: number | null;
+  updatedAt: string;
+  createdAt: string;
+}
+/**
+ * This interface was referenced by `Config`'s JSON-Schema
+ * via the `definition` "posts_select".
+ */
+export interface PostsSelect<T extends boolean = true> {
+  updatedAt?: T;
+  createdAt?: T;
+}
+/**
+ * This interface was referenced by `Config`'s JSON-Schema
+ * via the `definition` "media_select".
+ */
+export interface MediaSelect<T extends boolean = true> {
+  updatedAt?: T;
+  createdAt?: T;
+  url?: T;
+  thumbnailURL?: T;
+  filename?: T;
+  mimeType?: T;
+  filesize?: T;
+  width?: T;
+  height?: T;
+  focalX?: T;
+  focalY?: T;
+}
+/**
+ * This interface was referenced by `Config`'s JSON-Schema
+ * via the `definition` "payments_select".
+ */
+export interface PaymentsSelect<T extends boolean = true> {
+  provider?: T;
+  providerId?: T;
+  status?: T;
+  amount?: T;
+  currency?: T;
+  description?: T;
+  customer?: T;
+  invoice?: T;
+  metadata?: T;
+  providerData?: T;
+  refunds?: T;
+  updatedAt?: T;
+  createdAt?: T;
+}
+/**
+ * This interface was referenced by `Config`'s JSON-Schema
+ * via the `definition` "customers_select".
+ */
+export interface CustomersSelect<T extends boolean = true> {
+  email?: T;
+  name?: T;
+  phone?: T;
+  address?:
+    | T
+    | {
+        line1?: T;
+        line2?: T;
+        city?: T;
+        state?: T;
+        postal_code?: T;
+        country?: T;
+      };
+  providerIds?: T;
+  metadata?: T;
+  payments?: T;
+  invoices?: T;
+  updatedAt?: T;
+  createdAt?: T;
+}
+/**
+ * This interface was referenced by `Config`'s JSON-Schema
+ * via the `definition` "invoices_select".
+ */
+export interface InvoicesSelect<T extends boolean = true> {
+  number?: T;
+  customer?: T;
+  status?: T;
+  currency?: T;
+  items?:
+    | T
+    | {
+        description?: T;
+        quantity?: T;
+        unitAmount?: T;
+        totalAmount?: T;
+        id?: T;
+      };
+  subtotal?: T;
+  taxAmount?: T;
+  amount?: T;
+  dueDate?: T;
+  paidAt?: T;
+  payment?: T;
+  notes?: T;
+  metadata?: T;
+  updatedAt?: T;
+  createdAt?: T;
+}
+/**
+ * This interface was referenced by `Config`'s JSON-Schema
+ * via the `definition` "refunds_select".
+ */
+export interface RefundsSelect<T extends boolean = true> {
+  providerId?: T;
+  payment?: T;
+  status?: T;
+  amount?: T;
+  currency?: T;
+  reason?: T;
+  description?: T;
+  metadata?: T;
+  providerData?: T;
+  updatedAt?: T;
+  createdAt?: T;
+}
+/**
+ * This interface was referenced by `Config`'s JSON-Schema
+ * via the `definition` "users_select".
+ */
+export interface UsersSelect<T extends boolean = true> {
+  updatedAt?: T;
+  createdAt?: T;
+  email?: T;
+  resetPasswordToken?: T;
+  resetPasswordExpiration?: T;
+  salt?: T;
+  hash?: T;
+  loginAttempts?: T;
+  lockUntil?: T;
+}
+/**
+ * This interface was referenced by `Config`'s JSON-Schema
+ * via the `definition` "payload-locked-documents_select".
+ */
+export interface PayloadLockedDocumentsSelect<T extends boolean = true> {
+  document?: T;
+  globalSlug?: T;
+  user?: T;
+  updatedAt?: T;
+  createdAt?: T;
+}
+/**
+ * This interface was referenced by `Config`'s JSON-Schema
+ * via the `definition` "payload-preferences_select".
+ */
+export interface PayloadPreferencesSelect<T extends boolean = true> {
+  user?: T;
+  key?: T;
+  value?: T;
+  updatedAt?: T;
+  createdAt?: T;
+}
+/**
+ * This interface was referenced by `Config`'s JSON-Schema
+ * via the `definition` "payload-migrations_select".
+ */
+export interface PayloadMigrationsSelect<T extends boolean = true> {
+  name?: T;
+  batch?: T;
+  updatedAt?: T;
+  createdAt?: T;
+}
+/**
+ * This interface was referenced by `Config`'s JSON-Schema
+ * via the `definition` "auth".
+ */
+export interface Auth {
+  [k: string]: unknown;
+}
+
+
+declare module 'payload' {
+  export interface GeneratedTypes extends Config {}
+}

dev/payload.config.ts

@@ -0,0 +1,84 @@
+import { mongooseAdapter } from '@payloadcms/db-mongodb'
+import { lexicalEditor } from '@payloadcms/richtext-lexical'
+import { MongoMemoryReplSet } from 'mongodb-memory-server'
+import path from 'path'
+import { buildConfig } from 'payload'
+import { billingPlugin } from '../src/index.js'
+import sharp from 'sharp'
+import { fileURLToPath } from 'url'
+
+import { testEmailAdapter } from './helpers/testEmailAdapter.js'
+import { seed } from './seed.js'
+
+const filename = fileURLToPath(import.meta.url)
+const dirname = path.dirname(filename)
+
+if (!process.env.ROOT_DIR) {
+  process.env.ROOT_DIR = dirname
+}
+
+const buildConfigWithMemoryDB = async () => {
+  if (process.env.NODE_ENV === 'test') {
+    const memoryDB = await MongoMemoryReplSet.create({
+      replSet: {
+        count: 3,
+        dbName: 'payloadmemory',
+      },
+    })
+
+    process.env.DATABASE_URI = `${memoryDB.getUri()}&retryWrites=true`
+  }
+
+  return buildConfig({
+    admin: {
+      importMap: {
+        baseDir: path.resolve(dirname),
+      },
+    },
+    collections: [
+      {
+        slug: 'posts',
+        fields: [],
+      },
+      {
+        slug: 'media',
+        fields: [],
+        upload: {
+          staticDir: path.resolve(dirname, 'media'),
+        },
+      },
+    ],
+    db: mongooseAdapter({
+      ensureIndexes: true,
+      url: process.env.DATABASE_URI || '',
+    }),
+    editor: lexicalEditor(),
+    email: testEmailAdapter,
+    onInit: async (payload) => {
+      await seed(payload)
+    },
+    plugins: [
+      billingPlugin({
+        providers: {
+          test: {
+            enabled: true,
+            autoComplete: true,
+          }
+        },
+        collections: {
+          payments: 'payments',
+          customers: 'customers',
+          invoices: 'invoices',
+          refunds: 'refunds',
+        }
+      }),
+    ],
+    secret: process.env.PAYLOAD_SECRET || 'test-secret_key',
+    sharp,
+    typescript: {
+      outputFile: path.resolve(dirname, 'payload-types.ts'),
+    },
+  })
+}
+
+export default buildConfigWithMemoryDB()

dev/seed.ts

@@ -0,0 +1,149 @@
+import type { Payload } from 'payload'
+
+import { devUser } from './helpers/credentials.js'
+
+export const seed = async (payload: Payload) => {
+  // Seed default user first
+  const { totalDocs } = await payload.count({
+    collection: 'users',
+    where: {
+      email: {
+        equals: devUser.email,
+      },
+    },
+  })
+
+  if (!totalDocs) {
+    await payload.create({
+      collection: 'users',
+      data: devUser,
+    })
+  }
+
+  // Seed billing sample data
+  await seedBillingData(payload)
+}
+
+async function seedBillingData(payload: Payload): Promise<void> {
+  payload.logger.info('Seeding billing sample data...')
+
+  try {
+    // Check if we already have sample data
+    const existingCustomers = await payload.count({
+      collection: 'customers',
+      where: {
+        email: {
+          equals: 'john.doe@example.com',
+        },
+      },
+    })
+
+    if (existingCustomers.totalDocs > 0) {
+      payload.logger.info('Sample billing data already exists, skipping seed')
+      return
+    }
+
+    // Create a sample customer
+    const customer = await payload.create({
+      collection: 'customers',
+      data: {
+        email: 'john.doe@example.com',
+        name: 'John Doe',
+        phone: '+1-555-0123',
+        address: {
+          line1: '123 Main St',
+          city: 'New York',
+          state: 'NY',
+          postal_code: '10001',
+          country: 'US'
+        },
+        metadata: {
+          source: 'seed',
+          created_by: 'system'
+        }
+      }
+    })
+
+    payload.logger.info(`Created sample customer: ${customer.id}`)
+
+    // Create a sample invoice
+    const invoice = await payload.create({
+      collection: 'invoices',
+      data: {
+        number: 'INV-001-SAMPLE',
+        customer: customer.id,
+        currency: 'USD',
+        items: [
+          {
+            description: 'Web Development Services',
+            quantity: 10,
+            unitAmount: 5000, // $50.00 per hour
+            totalAmount: 50000 // $500.00 total
+          },
+          {
+            description: 'Design Consultation',
+            quantity: 2,
+            unitAmount: 7500, // $75.00 per hour
+            totalAmount: 15000 // $150.00 total
+          }
+        ],
+        subtotal: 65000, // $650.00
+        taxAmount: 5200, // $52.00 (8% tax)
+        amount: 70200, // $702.00 total
+        status: 'open',
+        dueDate: new Date(Date.now() + 30 * 24 * 60 * 60 * 1000).toISOString(), // 30 days from now
+        notes: 'Payment terms: Net 30 days. This is sample data for development.',
+        metadata: {
+          project: 'website-redesign',
+          billable_hours: 12,
+          sample: true
+        }
+      }
+    })
+
+    payload.logger.info(`Created sample invoice: ${invoice.number}`)
+
+    // Create a sample payment using test provider
+    const payment = await payload.create({
+      collection: 'payments',
+      data: {
+        provider: 'test',
+        providerId: `test_pay_sample_${Date.now()}`,
+        status: 'succeeded',
+        amount: 70200, // $702.00
+        currency: 'USD',
+        description: `Sample payment for invoice ${invoice.number}`,
+        customer: customer.id,
+        invoice: invoice.id,
+        metadata: {
+          invoice_number: invoice.number,
+          payment_method: 'test_card',
+          sample: true
+        },
+        providerData: {
+          testMode: true,
+          simulatedPayment: true,
+          autoCompleted: true
+        }
+      }
+    })
+
+    payload.logger.info(`Created sample payment: ${payment.id}`)
+
+    // Update invoice status to paid
+    await payload.update({
+      collection: 'invoices',
+      id: invoice.id,
+      data: {
+        status: 'paid',
+        payment: payment.id,
+        paidAt: new Date().toISOString()
+      }
+    })
+
+    payload.logger.info('Billing sample data seeded successfully!')
+
+  } catch (error) {
+    payload.logger.error('Error seeding billing data:', error)
+  }
+}

dev/tsconfig.json

@@ -0,0 +1,35 @@
+{
+  "extends": "../tsconfig.json",
+  "exclude": [],
+  "include": [
+    "**/*.js",
+    "**/*.jsx",
+    "**/*.mjs",
+    "**/*.cjs",
+    "**/*.ts",
+    "**/*.tsx",
+    "../src/**/*.ts",
+    "../src/**/*.tsx",
+    "next.config.mjs",
+    ".next/types/**/*.ts"
+  ],
+  "compilerOptions": {
+    "baseUrl": "./",
+    "paths": {
+      "@payload-config": [
+        "./payload.config.ts"
+      ],
+      "temp-plugin": [
+        "../src/index.ts"
+      ],
+      "temp-plugin/client": [
+        "../src/exports/client.ts"
+      ],
+      "temp-plugin/rsc": [
+        "../src/exports/rsc.ts"
+      ]
+    },
+    "noEmit": true,
+    "emitDeclarationOnly": false,
+  }
+}