Lucas and Luna unpack the uncomfortable truth behind API webhook delivery guarantees. Most developers assume at-least-once delivery means reliability, but the real failure mode is silent duplication. Using Stripe's idempotency keys and GitHub's webhook retry logic as case studies, they dissect why exactly-once delivery is mathematically impossible over a network, and how to build idempotent receivers that survive replay attacks, network partitions, and lazy engineering. Specifics include: how Stripe's 2-second timeout window works, why GitHub's 'redeliver' button is a footgun, and the one logging pattern that catches double charges before customers do. For engineers building payment integrations, event-driven architectures, or any system where webhooks carry business-critical payloads.

#Webhooks #API #Idempotency #EventDrivenArchitecture #Stripe #GitHub #RetryStrategy #ExactlyOnce #AtLeastOnce #NetworkReliability #APIDesign #SoftwareEngineering #DevTools #DeveloperExperience #Backend #FexingoBusiness #BusinessPodcast #TechPodcast

Keep every episode free: buymeacoffee.com/fexingo