Spark Platform Webhooks

generated: '2026-07-26'
method: searched
source: >-
  https://sparkplatform.com/docs/webhooks/webhooks (HTTP 200),
  https://services.reso.org/orgs?showStats=true&showEndorsements=true (RESO webhooks 1.0.0
  endorsement held directly by FBS, Status Certified, updated 2024-10-22), plus the
  /v1/developers/newsfeeds/webhooks request in the vendor's public Postman collection.
spec_type: Webhooks
description: >-
  Spark Platform's event surface. FBS publishes no AsyncAPI document — the webhook contract is
  prose plus the RESO Web API Entity Event convention it implements — so this artifact captures
  the webhook catalog rather than fabricating a spec. It is a genuinely certified event
  surface: FBS holds the RESO webhooks 1.0.0 endorsement directly, not through an MLS. Delivery
  is outbound only; there is no self-service subscription API in the public documentation, and
  subscriptions are arranged with FBS.

asyncapi_document:
  published: false
  probed:
    - {url: 'https://sparkplatform.com/asyncapi.yaml', note: not published}
    - {url: 'https://sparkplatform.com/docs/webhooks/webhooks', status: 200, note: prose documentation only}

transport:
  protocol: HTTPS
  method: POST
  content_type: application/json
  user_agent: NotificationSystem/0.1
  timeout: Subscriber endpoint must respond within roughly 2 seconds.
  retries: Up to 3 attempts with exponential backoff.

security:
  signature_header: Signature
  algorithm: HMAC-SHA256
  note: Each delivery is signed so the subscriber can verify authenticity.

payload:
  convention: RESO Web API Entity Event
  note: >-
    Payloads follow the RESO Entity Event shape rather than a Spark-proprietary envelope,
    which is what the webhooks 1.0.0 endorsement certifies.

events:
  - resource: Property
    trigger: A listing record changes in an upstream MLS.
  - resource: Member
    trigger: A member record changes in an upstream MLS.
  - resource: Office
    trigger: An office record changes in an upstream MLS.

subscription:
  self_service: false
  how: Arranged with FBS; not provisioned from the public documentation.
  filters: [MLS, resource type]
  catch_up_replay: true
  related_endpoint:
    path: /v1/developers/newsfeeds/webhooks
    method: GET
    host: https://replication.sparkapi.com
    source: postman/spark-platform-spark-web-api-queries.postman_collection.json
    note: >-
      A "Developers: News Feed Webhooks" request exists in the vendor's own Postman collection,
      so a developer-facing read endpoint for newsfeed webhooks does exist behind the licence
      gate. Its request/response schema is not published.

certification:
  endorsement: RESO webhooks
  version: 1.0.0
  status: Certified
  status_updated_at: '2024-10-22'
  holder: FBS (T00000052)
  verifiable_at: https://services.reso.org/orgs?showStats=true&showEndorsements=true

streaming:
  exists: false
  note: >-
    No websocket, SSE, Kafka or pub/sub surface is documented. Bulk data movement is handled by
    polling the replication host — see /docs/supporting_documentation/spark_replication and
    /docs/reso/reso_replication.