Source type

OpenAI Source

OpenAI sources receive API event webhooks such as response, batch, and fine-tuning lifecycle notifications using Standard Webhooks signatures.

OPENAIPOST, PUT, PATCH, DELETEWebhook Signing SecretDeveloper tools
OpenAI webhooks documentationAll source types
OpenAI sends webhook traffic to a FastHook source, FastHook validates the provider contract, records the request, and routes accepted events through connections to destinations.OpenAIProviderPOST, PUT, PATCH, DELETESignedFastHookSource URLOPENAIProvider credentialsignatureVerify before queue401 on auth failure405 on wrong methodAcceptedRequestverified: trueConnections route the accepted request to destinationsFilters, transformations, retries, replay, and destination signatures stay downstream from source verification.
FastHook keeps the provider-facing contract on the source. Accepted requests are stored before routing, while rejected requests keep enough evidence to debug signature, method, and challenge failures.

When to use this source type

Choose the OPENAI source type when OpenAI is the system sending webhook requests into FastHook. The source type keeps sender-specific setup close to the source: accepted methods, verification headers, challenge handling, and the exact credential fields are documented together so operators do not need to translate a generic HMAC form into a provider-specific contract.

FastHook verifies the source before accepted traffic is queued. A valid request is stored with verified: true, then connections route it to destinations. A bad signature, wrong token, or missing provider header is rejected as SOURCE_AUTH_FAILED. A method outside the allowed set is rejected as SOURCE_METHOD_NOT_ALLOWED.

FastHook configuration

In the dashboard, create a source, set Source Type to OpenAI, keep Authenticate enabled when verification is required, and fill the fields below.

Source Type

OPENAI

Allowed methods

POST, PUT, PATCH, DELETE

Authentication

Provider signature

Webhook Signing Secret

Copy this value from OpenAI and store it on the FastHook source.

{
  "type": "OPENAI",
  "config": {
    "auth_type": "PROVIDER_SIGNATURE",
    "auth": {
      "provider": "OPENAI"
    },
    "allowed_http_methods": ["POST","PUT","PATCH","DELETE"]
  }
}

HTTP methods

This source accepts only the methods listed below. Keep the set narrow so provider mistakes and accidental test calls are visible as rejected requests instead of being silently accepted.

POSTPUTPATCHDELETE

Headers and verification

FastHook verifies the provider-specific values below before the request is accepted. The comparison is done against the raw inbound request body or the exact provider-specific signing input described here.

webhook-id

Message id used in the Standard Webhooks signed payload.

webhook-timestamp

Unix timestamp used for replay protection and signature input.

webhook-signature

One or more Standard Webhooks signatures.

FastHook verifies webhook-signature over webhook-id + '.' + webhook-timestamp + '.' + raw body using the configured Standard Webhooks secret.

Provider setup checklist

  1. Create an OpenAI webhook endpoint with the generated FastHook Source URL.
  2. Copy the OpenAI webhook signing secret into FastHook.
  3. Route by event type when response, batch, or fine-tuning events should reach different destinations.
  4. Open OpenAI webhooks documentation when you need the provider's event list, dashboard steps, or retry policy.

Troubleshooting

  • No request appears: the provider is not calling the generated FastHook Source URL, the source URL was copied before saving, or the provider has not completed its setup validation.
  • 405 method rejected: the provider sent a method outside POST, PUT, PATCH, DELETE. Edit the source only if the provider documentation says that method is expected.
  • 401 source auth failed: check the configured FastHook field, the provider signing secret, and the header names listed on this page.
  • Signature mismatch: make sure the provider signs the same public Source URL it calls and that no proxy, parser, or manual resend changed the raw request body before FastHook received it.

Related docs