BettaPay Backend

Node.js backend services for the BettaPay Stellar payment infrastructure.

Structure

BettaPay-Backend/
├── package.json                  # Workspace root
├── pnpm-workspace.yaml           # pnpm workspace (services/* + shared/*)
├── tsconfig.json                 # Root TypeScript config with path aliases
├── .env.example                  # Environment variable template
│
├── services/
│   ├── api-gateway/              # Unified REST entry point  → port 3000
│   │   └── src/index.ts
│   ├── settlement-engine/        # Fee calculation & settlement  → port 3001
│   │   └── src/index.ts
│   ├── fx-engine/                # Exchange rate & quotes  → port 3002
│   │   └── src/index.ts
│   └── indexer/                  # Soroban event scanner  → port 3003
│       └── src/index.ts
│
└── shared/
    ├── types/                    # Shared TypeScript types (collapsed from packages/shared-types)
    │   └── index.ts
    ├── validation/               # Zod schemas + env validation
    │   └── index.ts
    └── stellar-utils/            # Stellar address / stroop utilities
        └── index.ts

Quick Start

# 1. Install deps
pnpm install        # or: npm install

# 2. Set env
cp .env.example .env
# Edit .env with your values

# 3. Run all services
pnpm dev            # starts api-gateway, fx-engine, settlement-engine, indexer

# Or run individual services
pnpm gateway:dev
pnpm fx:dev
pnpm settlement:dev
pnpm indexer:dev

Service Ports

Service	Port	Purpose
api-gateway	3000	Unified REST API — used by frontend
settlement-engine	3001	Settlement processing + fee splits
fx-engine	3002	FX rates and quotes
indexer	3003	Soroban contract event scanning

Key API Endpoints (api-gateway)

Method	Path	Description
GET	/api/health	Liveness probe
POST	/api/merchants	Register merchant
GET	/api/merchants/:id	Fetch merchant
POST	/api/payments	Initiate payment session
GET	/api/payments/:id	Get payment status
POST	/api/settlements	Trigger settlement
GET	/api/deployments	Testnet contract info

Contract Integration

The services reference Soroban contracts via environment variables:

SETTLEMENT_CONTRACT_ID=CBGBGKJSUY7XYB6HWW4CVAU6MW2KD25FSF45E5KCP53TKUK374MBZNFB
GOVERNANCE_CONTRACT_ID=CDPFWUTIXF5BC6BKNDLSQOZSDQCXAJNZFCZWHBE2RRHANRN25T3ILPZ7

These match the deployed contracts in BettaPay-Contract/. Update both .env files after each redeploy.

Shared Libraries

All shared code lives in shared/ and is imported via relative paths:

import { validateEnv } from '../../shared/validation/index.js';

No workspace aliases. Each service is independently workable.