Concurrent Carrier Migration Architecture: Coordinating USPS, FedEx, and UPS API Transitions Without Breaking Multi-Tenant Shipment Processing
Every integration team thinks they've mastered carrier APIs. USPS Web Tools shut down on January 25, 2026, and FedEx SOAP endpoints retire on June 1, 2026. For the first time in shipping software history, enterprise platforms face three simultaneous carrier migrations with compressed timelines and fundamentally different architectural