Momento Webhooks

generated: '2026-07-20'
method: derived
source:
  - grpc/momento-webhook.proto
  - grpc/momento-cachepubsub.proto
  - https://docs.momentohq.com/topics/develop/webhooks
spec_type: Webhooks
summary: >-
  Momento's event surface is Momento Topics — a serverless, best-effort multicast
  publish/subscribe event bus scoped to a cache. Webhooks let an external HTTPS
  destination (AWS Lambda, EventBridge, Slack, Discord, etc.) subscribe to the
  messages published on a Topic, so events flow out of Momento without a persistent
  gRPC subscriber.
event_bus:
  name: Momento Topics
  model: best-effort multicast pub/sub, per-topic ordering by topic_sequence_number
  delivery: server-streaming gRPC (Subscribe) or webhook fan-out
  message_kinds: [item, discontinuity, heartbeat]
  value_types: [text, binary]
webhooks:
  management:
    operations:
      - PutWebhook
      - DeleteWebhook
      - ListWebhooks
      - GetWebhookSecret
      - RotateWebhookSecret
    source: grpc/momento-webhook.proto
  binding:
    scoped_to: [cache_name, topic_name]
    destination: external HTTPS endpoint (commonly AWS Lambda; also Slack, Discord, EventBridge)
  security:
    signing: Each webhook has a rotatable secret used to sign delivered payloads so
      the receiver can verify authenticity (GetWebhookSecret / RotateWebhookSecret).
  payload:
    body: The published Topic value (text or binary) plus topic/sequence metadata.