ACS - Error API while Managing transactional messages
Hi,
I have a problem with transactional message.
We have configured the API process and we are doing a test from Postman as indicated in the documentation to call the event and trigger the transactional message. But we are getting this error:

We have specified the following information:
POST: https://mc.adobe.io/CompanyName/campaign/mcCompanyName/eventID
POST request Headers:
Authorization: Access Token
Cache-Control: no-cache
X-Api-Key: Client-ID
Content-Type: application/json;charset=utf-8
Content-Length:79
Do you know what should I change?
Thanks in advance
Best regards