FinTech

High-tech 3D isometric architecture of a digital payment gateway orchestrator with FastAPI

Building an Idempotent Payment Orchestrator with FastAPI: Surviving Double-Charges and Dropped Webhooks

A battle-tested guide to architecting a resilient payment orchestrator in FastAPI, handling double-spend race conditions, idempotency keys, and timing-safe webhook verification.

eSewa Intent API v2 production integration in Django REST Framework

Integrating eSewa Intent API v2 in a Django Backend

A complete production engineering guide to integrating eSewa Intent API v2 in Django, covering HMAC-SHA256 signatures, silent callback failures, and verification.