fix: resolve module resolution errors by replacing path aliases with relative imports

- Replace all @/ path aliases with proper relative imports and .js extensions
- Update @mollie/api-client peer dependency to support v4.x (^3.7.0 || ^4.0.0)
- Bump version to 0.1.5
- Ensure ESM compatibility for plugin distribution

Fixes module resolution error: "Cannot find package '@/collections'" when using
the plugin in external PayloadCMS projects.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/providers/index.ts

@@ -1,4 +1,4 @@
-export * from './mollie'
-export * from './stripe'
-export * from './types'
-export * from './currency'
+export * from './mollie.js'
+export * from './stripe.js'
+export * from './types.js'
+export * from './currency.js'

src/providers/mollie.ts

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

src/providers/types.ts

@@ -1,6 +1,6 @@
-import type { Payment } from '@/plugin/types/payments'
+import type { Payment } from '../plugin/types/payments.js'
 import type { Config, Payload } from 'payload'
-import type { BillingPluginConfig } from '@/plugin/config'
+import type { BillingPluginConfig } from '../plugin/config.js'
 
 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'
-import type { BillingPluginConfig } from '@/plugin/config'
-import type { ProviderData } from './types'
-import { defaults } from '@/plugin/config'
-import { extractSlug, toPayloadId } from '@/plugin/utils'
+import type { Payment } from '../plugin/types/payments.js'
+import type { BillingPluginConfig } from '../plugin/config.js'
+import type { ProviderData } from './types.js'
+import { defaults } from '../plugin/config.js'
+import { extractSlug, toPayloadId } from '../plugin/utils.js'
 
 /**
  * Common webhook response utilities