Production-focused PayU India payment provider for Medusa v2 with redirect checkout flow, callback handling, and fraud-aware verification.

• Redirect-based PayU checkout integration for Medusa payment sessions
• Hash generation and reverse-hash verification flow
• Webhook/callback handling for asynchronous payment status
• Hardened callback processing with replay protection
• Constant-time hash comparison and amount discrepancy guards
• Timeout configuration and retry-classification utilities

yarn add @sam-ael/medusa-plugin-payu

modules: [
  {
    resolve: "@medusajs/medusa/payment",
    options: {
      providers: [
        {
          resolve: "@sam-ael/medusa-plugin-payu/providers/payu",
          id: "payu",
          options: {
            merchantKey: process.env.PAYU_MERCHANT_KEY,
            merchantSalt: process.env.PAYU_MERCHANT_SALT,
            environment: process.env.PAYU_ENVIRONMENT || "test",
          },
        },
      ],
    },
  },
]

PAYU_MERCHANT_KEY=your_merchant_key
PAYU_MERCHANT_SALT=your_merchant_salt
PAYU_ENVIRONMENT=test

STOREFRONT_URL=http://localhost:8000
PAYU_REDIRECT_URL=/order/confirmed
PAYU_REDIRECT_FAILURE_URL=/checkout
PAYU_API_TIMEOUT_MS=30000

• Replay guard for repeated callback payloads
• Constant-time hash comparison for webhook verification
• Normalized callback parsing for structured and URL-encoded payload variants
• Amount discrepancy path for underpaid callback reports
• Timeout defaults centralized in provider config helpers

yarn typecheck
yarn lint
yarn test
yarn build

Smoke tests are available under src/tests.

MIT