docker compose up -d --build gateway wallet-core

cd gateway
go build -o gateway ./cmd/server
./gateway -config config.yaml

curl http://localhost:8080/health

{
  "service": "gateway",
  "version": "1.0.0",
  "healthy": true,
  "wallet_core": {
    "healthy": true,
    "version": "1.0.0"
  }
}

http://localhost:8080/docs

gateway/
├── cmd/
│   └── server/
│       └── main.go          # Entry point, route registration
├── internal/
│   ├── auth/                # JWT, API key validation
│   ├── config/              # YAML config loading
│   ├── handler/             # HTTP handlers (17 files)
│   │   ├── subscriber_handler.go
│   │   ├── card_handler.go
│   │   ├── wallet_handler.go
│   │   ├── agent_handler.go
│   │   ├── pos_handler.go
│   │   ├── compliance_handler.go
│   │   └── ...
│   ├── middleware/          # Auth, logging, rate limiting (12 files)
│   ├── utils/               # Helpers and utilities
│   └── wallet/              # gRPC client wrapper
├── docs/                    # Swagger generated docs
├── config.yaml              # Default configuration
└── Dockerfile

curl -X POST http://localhost:8080/api/v1/payments \
  -H "Authorization: Bearer API_KEY" \
  -H "X-Request-ID: unique-request-123" \
  -H "Content-Type: application/json" \
  -d '{"user_id": "u123", "recipient": "u456", "amount": 5000}'

{
  "error": "Error description",
  "code": "ERROR_CODE",
  "details": {}
}