Production-Grade Idempotency for Multi-Carrier Integration: Surviving OAuth Cascade Failures and Authentication Race Conditions Without Creating Duplicate Shipments
The numbers tell a stark story. API downtime surged by 60% between Q1 2024 and Q1 2025, with average uptime dropping from 99.66% to 99.46%. For carrier integration teams, this means something worse than network timeouts: duplicate shipments and inventory mismanagement when retry logic fails. 73% of integration