Finmatrix

Developers

Ship payment flows without fighting the API

Sandbox-first access, signed webhooks, and documentation shaped for engineering teams that need production-grade reliability.

Finmatrix developer APIs

REST APIs

Predictable resource-oriented endpoints for payments, payouts, refunds, and settlements.

Signed webhooks

Verify every callback with signatures so you never trust a payload you cannot validate.

Sandbox environment

Full test credentials with simulated success, failure, and pending bank responses.

Idempotent writes

Safe retries with idempotency keys — essential for unreliable networks and mobile clients.

Clear error model

Machine-readable error codes with human-readable messages your support team can act on.

Audit-friendly logs

Request references and timeline views that help debug production issues quickly.

Example

Create a payment intent

A typical collection call looks like this. You will receive a payment reference and redirect or intent details depending on the method — then webhooks confirm the final status.

  • Use idempotency keys on create endpoints
  • Verify webhook signatures before updating orders
  • Treat dashboard status and webhooks as source of truth
Get API credentials
POST /v1/paymentsapplication/json
{
  "amount": 49900,
  "currency": "INR",
  "method": "upi",
  "order_id": "ord_8f2a1c",
  "customer": {
    "email": "buyer@example.com"
  },
  "callback_url": "https://yourapp.com/payments/return"
}

Need an architecture review?

Before go-live, our team can review your webhook handling, reconciliation design, and failure paths — so production surprises stay rare.

Book a technical walkthrough