Messaging infrastructureHTTP API

Webhook subscriptions

Create subscriptions, verify signatures, process inbound events, and prevent double delivery during cutover.

Webhook subscriptions — contract and behavior

  • Subscriptions carry a caller-supplied signing secret and event destination.
  • The emitter signs the exact payload so consumers can verify integrity before processing it.
  • Inbound messages, reactions, delivery state, and related device events normalize before webhook dispatch.
  • Rollback must disable Most subscriptions before re-enabling a legacy emitter, otherwise message.received can fire twice.

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