1x1 tracking pixel embedded in outbound emails.
GET /v2/widget/email-tracking/{message_dispatch_id}/pixel.gif
No auth header (token-less). Tamper-resistance via HMAC parameters. On signature success, emits an `email_opened` engagement event. On signature failure: still returns 1x1 GIF (silent), logs for operator observability.
Operation
| Operation ID | emailTrackingPixel |
| Tags | Untagged |
Parameters
| Name | In | Type | Description |
|---|---|---|---|
| message_dispatch_id * | path | id | |
| c * | query | string | HMAC-signed contact_id (per 02-widget-runtime §10.5.2) |
| j * | query | string | HMAC-signed journey_id |
| t * | query | integer | UNIX timestamp; included in signed payload |
Responses
200
1x1 transparent GIF
Example request
GET https://api.digitalonboarding.com/v2/widget/email-tracking/{message_dispatch_id}/pixel.gif?<query-params>
Authorization: Bearer <partner-token>