Quickstart: receive your first webhook

1. Create an HTTPS webhook endpoint

Create a route in your application that can receive Brale webhook deliveries. Example endpoint:

POST https://your-app.example.com/webhooks/brale

For local development:

ngrok http 4000

Then use:

https://<your-ngrok-host>/webhooks/brale

2. Get an access token with webhook scopes

Your OAuth application or API credential needs webhook scopes (these are provisioned by default when you make a credential set).

Scope	Required for
`webhooks:read`	List event types, list subscriptions, inspect delivery logs
`webhooks:write`	Create, update, and archive webhook subscriptions

For subscription creation, use a credential with both webhooks:read and webhooks:write.

3. Discover available event types

curl https://api.brale.xyz/accounts/{account_id}/webhooks/event_types \
  -H "Authorization: Bearer {access_token}"

Example response:

{
  "event_types": [
    {
      "event_type": "payment.completed",
      "summary": "Emitted when a payment reaches complete status."
    },
    {
      "event_type": "transfer.completed",
      "summary": "Emitted when a transfer (token order) reaches complete status."
    },
    {
      "event_type": "transfer.failed",
      "summary": "Emitted when a transfer (token order) reaches failed status."
    }
  ]
}

4. Create a webhook subscription

Create a subscription for your endpoint and event types.

curl -X POST https://api.brale.xyz/accounts/{account_id}/webhooks \
  -H "Authorization: Bearer {access_token}" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: {uuid}" \
  -d '{
    "url": "https://your-app.example.com/webhooks/brale",
    "events": ["transfer.completed"]
  }'

Example response:

{
  "id": "3D3jNzs2r7Sf78qtYpRe1biscLG",
  "sharedSecret": "base64url-encoded-secret",
  "events": ["transfer.completed"],
  "url": "https://your-app.example.com/webhooks/brale",
  "status": "active"
}

Important:

sharedSecret is returned only once.
Store it immediately in a secrets manager or encrypted environment variable.
Do not log it.
Do not expose it to browsers or client-side code.
If you lose it, archive the subscription and create a new one.

5. Verify incoming webhooks

Every webhook includes:

x-request-signature-sha-256: <lowercase hex HMAC-SHA256>
idempotency-key: <deterministic UUID derived from event id>
content-type: application/json

Notes:

Header names may appear with different capitalization depending on your framework/server. Treat them as case-insensitive.
The Idempotency-Key you send to the management API is not the same concept as the idempotency-key header Brale sends with each webhook delivery. Use the webhook event id and/or the webhook idempotency-key header for deduplication.

Verification steps:

Read the exact raw request body bytes.
Decode sharedSecret from Base64URL to raw bytes.
Compute HMAC-SHA256 over the raw request body.
Encode the digest as lowercase hex.
Compare to x-request-signature-sha-256 using constant-time comparison.
Only then parse and process the JSON payload.

6. Return 2xx quickly

Return any 2xx response after verification and safe receipt. If processing takes longer, acknowledge quickly and process asynchronously.

Verify signature → record event id → acknowledge 200 → process async

7. Deduplicate events

Webhook deliveries are at-least-once. Your endpoint may receive the same event more than once. Deduplicate using:

The envelope id
The idempotency-key header

Process each logical event once.

Overview

Key concepts

Webhooks

Quickstart

Quickstart: receive your first webhook

1. Create an HTTPS webhook endpoint

2. Get an access token with webhook scopes

3. Discover available event types

4. Create a webhook subscription

5. Verify incoming webhooks

6. Return 2xx quickly

7. Deduplicate events

​Quickstart: receive your first webhook

​1. Create an HTTPS webhook endpoint

​2. Get an access token with webhook scopes

​3. Discover available event types

​4. Create a webhook subscription

​5. Verify incoming webhooks

​6. Return 2xx quickly

​7. Deduplicate events

Quickstart: receive your first webhook

1. Create an HTTPS webhook endpoint

2. Get an access token with webhook scopes

3. Discover available event types

4. Create a webhook subscription

5. Verify incoming webhooks

6. Return 2xx quickly

7. Deduplicate events