Blog
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The Unified Payment Format: PAYIN_ORANGE_CI
How 0fee.dev unified 117 payment methods into the PAYIN_OPERATOR_COUNTRY format, simplifying API calls to a single field. By Juste Thales Gnimavo and Claude.
Encryption and Credential Management for Payment Providers
How 0fee.dev encrypts payment provider credentials with Fernet/AES, manages per-app secrets, and what the security audit found. By Juste Thales Gnimavo and Claude.
Stripe Integration: Global Card Payments
How 0fee.dev integrates Stripe Checkout Sessions for global card payments, handling zero-decimal currencies and middleman callbacks.
42 Files, 7,900 Lines, 45 Minutes: The First Session
How we built the entire 0fee.dev backend in 45 minutes: 42 files, 7,900 lines, 5 payment providers, 30+ API endpoints. By Juste Thales Gnimavo and Claude.
The Africa Payment Problem: Why Stripe Is Not Enough
Africa's $1T+ mobile money market needs more than Stripe. How 0fee.dev solves the Africa payment problem. By Juste Thales Gnimavo and Claude.
The Auditor Caught What the Builder Missed
How independent AI audit sessions found 5 Critical, 12 Important, and 19 Minor issues in 3,200 lines of Rust CLI code -- and why the builder never would have caught them.
Payment Links: Shareable URLs for Any Payment
How 0fee.dev payment links work: shareable URLs, customer data collection, currency conversion, and invoice generation. By Juste Thales Gnimavo and Claude.
One Command to Deploy: How We Built sh0 push
How we built sh0 push -- a single command that detects your stack, packages files, uploads, builds, and returns a live URL in under 40 seconds.
One API, 53+ Providers, 200+ Countries
How 0fee.dev unifies 53+ payment providers across 200+ countries into one API. Code examples, routing logic, and coverage. By Juste Thales Gnimavo.
Webhook Delivery and Retry System
How 0fee.dev delivers webhooks with HMAC-SHA256 signatures, exponential backoff retries, and auto-disable after failures. By Juste Thales Gnimavo and Claude.
The Provider Adapter Pattern: One Interface for Every Payment System
How 0fee.dev uses the adapter pattern to unify Stripe, PayPal, Hub2, and PawaPay behind one Python interface. By Juste Thales Gnimavo and Claude.
Hosted Checkout Pages: The Redirect Flow
How 0fee.dev built server-rendered hosted checkout pages with Jinja2, multi-language support, dark mode, and sandbox mode.