Framework-agnostic payment orchestration library for Node.js with a punch CLI.

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• npm: https://www.npmjs.com/package/punch-library
• GitHub: https://github.com/oguzhan18/punch-library

# npm
npm install punch-library

# yarn
yarn add punch-library

# pnpm
pnpm add punch-library

• Name: Oguzhan Cart
• Website: https://oguzhancart.dev
• Email: oguzhancart1@gmail.com
• LinkedIn: https://www.linkedin.com/in/o%C4%9Fuzhan-%C3%A7art-b73405199/
• GitHub: http://github.com/oguzhan18
• Medium: https://medium.com/@oguzhancart1
• CodePen: https://codepen.io/oguzhan1881

• Unified payment API across providers (create/capture/cancel/refund)
• Provider-level custom-operation API to access advanced provider endpoints beyond unified contract
• Provider catalog with payment/webhook documentation links
• Programmatic webhook parsing API (parseWebhook)
• Idempotency key support (x-idempotency-key or idempotencyKey)
• Correlation ID support (x-correlation-id) + structured HTTP logs
• Phase-3 platform controls:
  • Provider rate limiting
  • Provider circuit breaker
  • Webhook idempotency handling
  • Webhook dead-letter queue (DLQ)
  • Outbox event store (memory or file)
• Stripe support:
  • Payment intent creation
  • Capture, cancel, refund
  • Webhook signature verification (stripe-signature)
• PayPal support:
  • OAuth2 token flow
  • Order create/capture + capture refund
  • Webhook signature verification (verify-webhook-signature API)
• Adyen support:
  • Payment create/capture/cancel/refund
  • Webhook signature verification (HMAC)
• Square support:
  • Payment create/capture/cancel/refund
  • Webhook signature verification

stripe, paypal, adyen, square, braintree, checkout, worldpay, razorpay, paddle, twocheckout, iyzico, paytr, parampos, sipay, hepsipay

Full live API + webhook support is not complete for all providers yet.

• Implemented: stripe, paypal, adyen, square
• Stub adapters: all other providers (visible in catalog)

npm install
npm run build

npm run docs:serve

Then open:

• http://localhost:3004

Vercel is configured to deploy Docsify static docs (not NestJS runtime) via vercel.json.

Instantiate the library:

import { Punch } from 'punch-api';

const punch = new Punch({
  exposeUnconfiguredProviders: false,
  stateStoreMode: 'memory'
});

Main methods:

• listProviders()
• listCatalog()
• createIntent() / createPayment()
• capturePayment()
• cancelPayment()
• refundPayment()
• executeCustomOperation()
• parseWebhook()
• listOutbox() / clearOutbox()
• listWebhookDlq() / replayWebhookDlqItem() / clearWebhookDlq()
• resilienceSnapshot()

Example intent payload:

{
  "provider": "stripe",
  "amount": 1000,
  "currency": "TRY",
  "idempotencyKey": "pay-create-ord-42",
  "customerId": "cust_1",
  "metadata": {
    "orderId": "ORD-42"
  }
}

Example custom operation payload:

{
  "endpoint": "/payment_intents",
  "method": "POST",
  "bodyType": "form",
  "idempotencyKey": "custom-op-42",
  "body": {
    "amount": 1000,
    "currency": "usd",
    "automatic_payment_methods[enabled]": true
  }
}

• PUNCH_STRIPE_API_KEY
• PUNCH_STRIPE_WEBHOOK_SECRET (required for Stripe webhook verification)
• PUNCH_PAYPAL_CLIENT_ID, PUNCH_PAYPAL_CLIENT_SECRET, PUNCH_PAYPAL_WEBHOOK_ID
• PUNCH_ADYEN_API_KEY, PUNCH_ADYEN_MERCHANT_ACCOUNT
• PUNCH_ADYEN_HMAC_KEY (required for Adyen webhook verification)
• PUNCH_SQUARE_API_KEY, PUNCH_SQUARE_LOCATION_ID
• PUNCH_SQUARE_WEBHOOK_SIGNATURE_KEY, PUNCH_SQUARE_WEBHOOK_NOTIFICATION_URL
• PUNCH_<PROVIDER>_API_KEY for other providers
• Stub provider live mode (for braintree, checkout, worldpay, razorpay, paddle, twocheckout, iyzico, paytr, parampos, sipay, hepsipay):
  • If API key includes _mock_, mock mode is used.
  • If API key does not include _mock_, these are required:
    • PUNCH_<PROVIDER>_CREATE_ENDPOINT
    • PUNCH_<PROVIDER>_CAPTURE_ENDPOINT
    • PUNCH_<PROVIDER>_CANCEL_ENDPOINT
    • PUNCH_<PROVIDER>_REFUND_ENDPOINT
  • Optional:
    • PUNCH_<PROVIDER>_AUTH_MODE (bearer|basic|api_key)
    • PUNCH_<PROVIDER>_BASIC_USERNAME, PUNCH_<PROVIDER>_BASIC_PASSWORD
    • PUNCH_<PROVIDER>_API_KEY_HEADER
    • PUNCH_<PROVIDER>_IDEMPOTENCY_HEADER
    • PUNCH_<PROVIDER>_WEBHOOK_SIGNATURE_REQUIRED
    • PUNCH_<PROVIDER>_WEBHOOK_SIGNATURE_HEADER
    • PUNCH_<PROVIDER>_WEBHOOK_SIGNATURE_SECRET
    • PUNCH_<PROVIDER>_WEBHOOK_SIGNATURE_ALGORITHM
• Optional base URLs for custom operation mode:
  • PUNCH_STRIPE_BASE_URL
  • PUNCH_PAYPAL_BASE_URL
  • PUNCH_ADYEN_BASE_URL
  • PUNCH_SQUARE_BASE_URL
  • PUNCH_CHECKOUT_BASE_URL
  • PUNCH_WORLDPAY_BASE_URL
  • PUNCH_RAZORPAY_BASE_URL
  • PUNCH_PADDLE_BASE_URL
  • PUNCH_IYZICO_BASE_URL
  • PUNCH_PAYTR_BASE_URL
  • PUNCH_BRAINTREE_BASE_URL
  • PUNCH_TWOCHECKOUT_BASE_URL
  • PUNCH_PARAMPOS_BASE_URL
  • PUNCH_SIPAY_BASE_URL
  • PUNCH_HEPSIPAY_BASE_URL
• PUNCH_EXPOSE_UNCONFIGURED_PROVIDERS=true to expose unconfigured providers in API responses
• PUNCH_RATE_LIMIT_WINDOW_MS, PUNCH_RATE_LIMIT_MAX
• PUNCH_CIRCUIT_FAILURE_THRESHOLD, PUNCH_CIRCUIT_OPEN_MS
• PUNCH_WEBHOOK_IDEMPOTENCY_TTL_MS
• PUNCH_WEBHOOK_MAX_ATTEMPTS, PUNCH_WEBHOOK_RETRY_DELAY_MS
• PUNCH_STATE_STORE_MODE (memory or file)
• PUNCH_STATE_STORE_DIR (default .punch-state)

Link the CLI once:

npm run cli:link

Then use it directly:

punch list
punch status
punch new stripe
punch new paypal --key=live_or_sandbox_key
punch remove stripe
punch doctor
punch doctor --fix
punch template stripe

Disable CLI banner if needed:

PUNCH_NO_BANNER=true punch status

CLI commands:

• punch new <provider>
  • Creates/updates provider API key in .env
  • Adds provider-specific extra keys for implemented providers (Stripe/PayPal/Adyen/Square)
  • Updates PUNCH_ENABLED_PROVIDERS
  • Creates/updates punch.providers.json
  • --key=... to provide a custom API key
  • --no-enable to skip enabling provider in PUNCH_ENABLED_PROVIDERS
• punch status [--json]
  • Shows provider configuration status from .env and punch.providers.json
• punch list [--json]
  • Lists provider, env key, and docs URL
• punch remove <provider>
  • Removes provider key and enablement from .env
  • Removes provider from punch.providers.json
• punch doctor [--json]
  • Validates .env and punch.providers.json consistency
  • Returns exit code 1 on critical errors
• punch doctor --fix [--json]
  • Auto-creates missing .env
  • Backfills PUNCH_ENABLED_PROVIDERS from punch.providers.json when missing
  • Adds mock API keys for enabled providers that are missing keys
  • Synchronizes punch.providers.json with PUNCH_ENABLED_PROVIDERS
• punch template <provider> [--print]
  • Generates provider-specific custom operation templates
  • Writes template to punch.templates/<provider>.json
  • --print returns JSON template to stdout

Unlink when needed:

npm run cli:unlink

import { PunchClient } from 'punch-api';

const client = new PunchClient();
const payment = await client.createPayment({
  provider: 'stripe',
  amount: 1200,
  currency: 'TRY'
});

await client.refundPayment({
  provider: 'stripe',
  paymentId: payment.id,
  amount: 1200,
  currency: 'TRY'
});

await client.executeCustomOperation({
  provider: 'stripe',
  endpoint: '/customers',
  method: 'POST',
  bodyType: 'form',
  body: {
    email: 'dev@company.com'
  }
});

import { Punch } from 'punch-api';

const punch = new Punch({ stateStoreMode: 'file' });
const providers = punch.listProviders();
console.log(providers);

• test/provider-registry.spec.ts: configured provider filtering
• test/stripe-webhook.spec.ts: Stripe webhook signature verification
• test/cli.spec.ts: CLI integration checks (new/remove/doctor/template)
• test/payment-provider-resilience.spec.ts: rate limit + circuit breaker checks
• test/payment-webhook-idempotency.spec.ts: webhook duplicate detection
• test/payments.service.phase3.spec.ts: outbox + DLQ behavior
• test/provider-definition-of-done.spec.ts: per-provider Definition of Done contract checks
• test/persistent-storage.spec.ts: file-backed outbox + DLQ persistence checks
• test/stub-provider-standardization.spec.ts: standardized lifecycle on stub providers
• test/payments.e2e.ts: e2e API flow checks

Quality gates:

• GitHub Actions CI: .github/workflows/ci.yml (build + unit/integration + e2e on Node 20/22)

Before publish:

npm run release:preflight

Publish to npm:

npm login
npm run publish:npm

If your account requires publish 2FA:

NPM_OTP=123456 npm run publish:npm

Publish with Yarn Berry:

yarn npm login
npm run publish:yarn

Publish with Yarn Classic:

npm run publish:yarn:classic

• Docsify app entry: docs/index.html
• Sidebar: docs/_sidebar.md
• Navbar: docs/_navbar.md
• Home page: docs/README.md
• Technical reference: docs/technical-documentation.md