Webhooks look like the simplest thing in your architecture until they ruin your night. Five practices separate the teams that sleep well. One: treat every webhook as untrusted input until you verify the signature. Two: respond fast and process slow. Queue the work, confirm receipt in under a second. Three: make handlers idempotent, because duplicates are not a bug in webhooks, they are a feature of the internet. Four: log every payload before you touch it, so failures are debuggable. Five: alert on silence. A webhook that stops arriving is a bigger emergency than one that errors loudly. Teams that follow all five barely remember webhooks exist. Teams that skip them run their business on hope.