chore: Remove unused billing-related collections, types, and utility modules

- Drop `customers` collection and associated types (`types/index.ts`, `payload.ts`)
- Remove generated `payload-types.ts` file
- Clean up unused exports and dependencies across modules
- Streamline codebase by eliminating redundant billing logic

src/index.ts

@@ -1,98 +1,3 @@
-import type { Config } from 'payload'
-
-import type { BillingPluginConfig, CustomerInfoExtractor } from './types'
-
-import { createCustomersCollection } from './collections/customers'
-import { createInvoicesCollection } from './collections/invoices'
-import { createPaymentsCollection } from './collections/payments'
-import { createRefundsCollection } from './collections/refunds'
-
 export * from './types'
 
-// Default customer info extractor for the built-in customer collection
-export const defaultCustomerInfoExtractor: CustomerInfoExtractor = (customer) => {
-  return {
-    name: customer.name || '',
-    email: customer.email || '',
-    phone: customer.phone,
-    company: customer.company,
-    taxId: customer.taxId,
-    billingAddress: customer.address ? {
-      line1: customer.address.line1 || '',
-      line2: customer.address.line2,
-      city: customer.address.city || '',
-      state: customer.address.state,
-      postalCode: customer.address.postalCode || '',
-      country: customer.address.country || '',
-    } : undefined,
-  }
-}
 
-export const billingPlugin = (pluginConfig: BillingPluginConfig = {}) => (config: Config): Config => {
-  if (pluginConfig.disabled) {
-    return config
-  }
-
-  // Initialize collections
-  if (!config.collections) {
-    config.collections = []
-  }
-
-  const customerSlug = pluginConfig.collections?.customers || 'customers'
-
-  config.collections.push(
-    createPaymentsCollection(pluginConfig.collections?.payments || 'payments'),
-    createCustomersCollection(customerSlug),
-    createInvoicesCollection(
-      pluginConfig.collections?.invoices || 'invoices',
-      pluginConfig.collections?.customerRelation !== false ? customerSlug : undefined,
-      pluginConfig.customerInfoExtractor
-    ),
-    createRefundsCollection(pluginConfig.collections?.refunds || 'refunds'),
-  )
-
-  // Initialize endpoints
-  if (!config.endpoints) {
-    config.endpoints = []
-  }
-
-  config.endpoints?.push(
-    // Webhook endpoints
-    {
-      handler: (_req) => {
-        try {
-          const provider = null
-          if (!provider) {
-            return Response.json({ error: 'Provider not found' }, { status: 404 })
-          }
-
-          // TODO: Process webhook event and update database
-
-          return Response.json({ received: true })
-        } catch (error) {
-          // TODO: Use proper logger instead of console
-          // eslint-disable-next-line no-console
-          console.error('[BILLING] Webhook error:', error)
-          return Response.json({ error: 'Webhook processing failed' }, { status: 400 })
-        }
-      },
-      method: 'post',
-      path: '/billing/webhooks/:provider'
-    },
-  )
-
-  // Initialize providers and onInit hook
-  const incomingOnInit = config.onInit
-
-  config.onInit = async (payload) => {
-    // Execute any existing onInit functions first
-    if (incomingOnInit) {
-      await incomingOnInit(payload)
-    }
-
-  }
-
-  return config
-}
-
-export default billingPlugin