Webhooks
Transactional email sent
Sent when a transactional email is sent to a contact. Contains a transactionalId value plus contactIdentity and email objects.
WEBHOOK
Authorizations
Bearer authentication header of the form Bearer <token>, where <token> is your auth token.
Headers
Unique message ID. Use to deduplicate deliveries.
Unix timestamp of when the message was sent.
HMAC signature for verifying the request. Verify using your endpoint signing secret from the Loops dashboard.
Body
application/json
Response
200
Webhook received successfully. Return any 2xx status code to acknowledge delivery.
Last modified on July 30, 2026
Related topics
WebhooksAPI ChangelogZapier integrationTransactional emailSending transactional emails to group inboxes
