diff --git a/backend/package.json b/backend/package.json
index 0583a100..af6db321 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -28,6 +28,8 @@
     "generate:client": "ts-node scripts/generate-client.ts"
   },
   "dependencies": {
+    "@aws-sdk/client-s3": "^3.787.0",
+    "@aws-sdk/s3-request-presigner": "^3.787.0",
     "@bull-board/api": "^6.20.6",
     "@bull-board/express": "^6.20.6",
     "@nestjs/axios": "^4.0.0",
diff --git a/backend/src/app.module.ts b/backend/src/app.module.ts
index 9721b2ab..21fbcfac 100644
--- a/backend/src/app.module.ts
+++ b/backend/src/app.module.ts
@@ -85,6 +85,7 @@ import { BulkPaymentModule } from './bulk-payments/bulk-payment.module';
 import { PayoutsModule } from './payouts/payouts.module';
 import { GeoModule } from './geo/geo.module';
 import { GeoBlockMiddleware } from './geo/geo-block.middleware';
+import { ReceiptModule } from './receipt/receipt.module';
 
 @Module({
   imports: [
@@ -252,6 +253,8 @@ import { GeoBlockMiddleware } from './geo/geo-block.middleware';
     FeatureFlagModule,
     GeoModule,
 
+    // Receipts — on-demand PDF receipt generation + R2 storage + email delivery.
+    ReceiptModule,
     PayoutsModule,
 
     // Global search — users, transactions, paylinks.