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.

July 10, 2026 · 7 min · 1285 words · Rishav Dahal
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.

June 15, 2026 · 16 min · 3267 words · Rishav Dahal
Google AdSense approval checklist and monetization audit blueprint for 2026

Google AdSense Approval Checklist for 2026

A practical AdSense approval checklist to avoid low-value content and policy rejection issues in 2026.

February 23, 2026 · 2 min · 389 words · Rishav Dahal
AI-generated recipe generator analyzing kitchen ingredients

Building a Recipe Generator with Generative AI

How I built an AI-powered tool to generate recipes from fridge photos using Gemini, RAG, and structured outputs.

January 9, 2025 · 2 min · 414 words · Rishav Dahal
Comparison of Noisy Document vs Pre-processed Clean Document for OCR

Improving OCR Accuracy on Document Images

Practical computer vision pre-processing techniques including denoising, thresholding, binarization, and deskewing to dramatically enhance OCR recognition accuracy on real-world document images.

January 9, 2025 · 4 min · 785 words · Rishav Dahal