diff --git a/backend/services/reward-service/src/domain/domain.module.ts b/backend/services/reward-service/src/domain/domain.module.ts
index 14646ce4..4315537b 100644
--- a/backend/services/reward-service/src/domain/domain.module.ts
+++ b/backend/services/reward-service/src/domain/domain.module.ts
@@ -1,8 +1,10 @@
 import { Module } from '@nestjs/common';
 import { RewardCalculationService } from './services/reward-calculation.service';
 import { RewardExpirationService } from './services/reward-expiration.service';
+import { InfrastructureModule } from '../infrastructure/infrastructure.module';
 
 @Module({
+  imports: [InfrastructureModule],
   providers: [
     RewardCalculationService,
     RewardExpirationService,
diff --git a/backend/services/reward-service/src/infrastructure/infrastructure.module.ts b/backend/services/reward-service/src/infrastructure/infrastructure.module.ts
index 67cbebca..c13bf0ec 100644
--- a/backend/services/reward-service/src/infrastructure/infrastructure.module.ts
+++ b/backend/services/reward-service/src/infrastructure/infrastructure.module.ts
@@ -24,15 +24,19 @@ import { REFERRAL_SERVICE_CLIENT, AUTHORIZATION_SERVICE_CLIENT } from '../domain
       provide: REWARD_SUMMARY_REPOSITORY,
       useClass: RewardSummaryRepositoryImpl,
     },
+    // Register concrete classes first
+    ReferralServiceClient,
+    AuthorizationServiceClient,
+    WalletServiceClient,
+    // Then provide token aliases using useExisting
     {
       provide: REFERRAL_SERVICE_CLIENT,
-      useClass: ReferralServiceClient,
+      useExisting: ReferralServiceClient,
     },
     {
       provide: AUTHORIZATION_SERVICE_CLIENT,
-      useClass: AuthorizationServiceClient,
+      useExisting: AuthorizationServiceClient,
     },
-    WalletServiceClient,
   ],
   exports: [
     PrismaService,