The Brief
TransactBridge is a Merchant of Record (MoR) solutions provider for the Indian payments market — enabling businesses to accept payments via UPI, Netbanking, cards, and digital wallets without having to navigate India’s regulatory and banking infrastructure directly.
The developer audience is engineering teams integrating payment acceptance into e-commerce platforms, gaming products, and SaaS applications targeting Indian users. These are developers who need to move fast, test confidently, and understand the India-specific payment landscape that shapes how the APIs behave.
What I Built
End-to-end documentation across TransactBridge’s integration surfaces:
- REST API Reference — Complete documentation for TransactBridge’s core JSON REST APIs, covering authentication, endpoint references, request and response schemas, error handling, and payment status flows across all supported payment methods
- Checkout.js Integration Guide — Developer guide for embedding TransactBridge’s hosted payment widget — covering setup, configuration options, event handling, and customisation, with working code examples for common integration patterns
- Subscriptions API Documentation — Reference and guide documentation for the recurring billing API, covering UPI and card subscription flows, plan management, and webhook handling — written for SaaS teams building subscription products for the Indian market
- Postman Collection Documentation — Companion documentation for TransactBridge’s pre-built Postman collection, enabling developers to test the full API surface against a sandbox environment before writing a single line of integration code
Approach
Payment API documentation has a specific failure mode: if a developer misunderstands an error code, a webhook payload, or a payment status transition, real money is affected. Precision isn’t optional here.
India-specific payment methods add another layer of complexity. UPI flows, Netbanking redirects, and digital wallet integrations each have behaviour that developers unfamiliar with the Indian payments ecosystem won’t anticipate from the API surface alone. Good documentation for this market has to explain the why behind the behaviour, not just the what.
Every integration example was tested against the TransactBridge sandbox. Every error response was a documented one, not a guess.
Results
TransactBridge now has a developer portal that gives engineering teams a clear, accurate path from API keys to live payment integration — with enough depth on India-specific payment methods to reduce the confusion that typically adds days to payment integration projects in this market.