The secret the calling app's deliveries are signed with in this organization

GET /signing-secret

The secret the calling app's deliveries are signed with in this organization: Manifold-Signature: t=<unix seconds>,v1=<hex HMAC-SHA256 of "<t>.<raw body>">.

Verify it over the raw body and refuse one more than five minutes old.

Access

Requires a signed-in session: an app token: subscriptions and their deliveries belong to the calling app alone, and each topic is held to its own grant

Send Authorization: Bearer $APP_TOKEN.

How scopes come from roles: Scopes and roles. Getting a token: Authentication and app tokens.

AI agent tool

No agent tool. An app's webhook plumbing — its subscriptions, delivery log and signing secret — answers that app's own token alone; an agent acts as a person and reads what happened through the journals' tools instead.

Connecting an agent: AI agents.

Example

curl

curl -X GET 'https://webhooks.getmanifold.io/signing-secret' \
  -H "Authorization: Bearer $APP_TOKEN"

JavaScript (fetch)

const response = await fetch("https://webhooks.getmanifold.io/signing-secret", {
  method: "GET",
  headers: { Authorization: `Bearer ${process.env.APP_TOKEN}` },
});
if (!response.ok) throw new Error(`${response.status}: ${await response.text()}`);
const answer = await response.json();

Response · 200 · application/json

{
  "secret": "5e0b8c4a2f7d19e63b1a0c9f8e7d6a5b4c3d2e1f0a9b8c7d6e5f4a3b2c1d0e9f"
}

The panel writes this call in other languages. It does not send it: Manifold's APIs do not take calls from a web page on another site, so run the call from your own code or terminal. The whole API as OpenAPI: webhooks.openapi.json. Base URL https://webhooks.getmanifold.io.

Errors

Every refusal is a status and a JSON body whose _tag names it. A refused call changes nothing.

`401`

Refusal	What it means	What to do
`Unauthorized` reason	The token is missing, expired or not one Manifold issued.	Get a fresh token and send the call again.
`TokenAlreadyUsed` tokenId	A single-use app token was already spent.	Mint a new token for this call.

`402`

Refusal	What it means	What to do
`SubscriptionRequired` status	The organization's subscription has lapsed, so writes are refused.	An owner settles billing. Reads still work meanwhile.

`403`

Refusal	What it means	What to do
`AppTokenRequired` reason	Only an app's own token may call this, not a person's.	Call it with the app's token.
`TenantRequired` userId	The token names no organization.	Choose the organization, then get a new token.
`ScopeRequired` required	The token's roles do not grant the scope this call needs.	Ask an owner or admin for a role that grants it.

`409`

Refusal	What it means	What to do
`MirroredFromSource` source	This area is fed by your source system until the organization goes live.	Make the change in the source system, or go live first.

`503`

Refusal	What it means	What to do
`RequestLogUnavailable` tokenId, reason	The service could not record the request, so it did nothing.	Try again shortly.

How refusals work everywhere: Errors.