If you consider Campaign Standard (as you posted in ACS forum) then No, it won't work in that way.You could do a single call to a web service including al relevant profile information needed. The web service then needs to return e.g. 1 row per profile which can be joined back.Potentially an in-betwe...
Unfortunately as a customer xou can't see MTA logs.You could enable verbose logging for the external account and ask Adobe Support to check/provide the logs.
https://docs.adobe.com/content/help/en/campaign-standard/using/testing-and-sending/preparing-and-testing-messages/managing-test-profiles-and-sending-proofs.html#using-trapsYou have to define a test profileprofile of type trap for that. If it's multiple users, you can create an audience of test users...
It's only on clicks as only then the relevant cookies are read/created.During open no cookies are checked, i.e. no known visitor ID. Also with e.g. using Outlook or so, anyway the cookie from the web browser containing ECID won't be known
Is the JSON content exactly the same?I saw issues where the actual JSON had nulls or different data formats.You may have to check the column. definition in the activity if the automatic. parsing generated something useful
Unfortunately the format supported is rather limited (see docu below).Anything not following this standard can't be parsed. (Mainly then nothing can be parsed)So basically you nearly always needs something intermediary translating the data from the public service to ACS JSON format. https://docs.ado...
You may use External API activity: https://docs.adobe.com/content/help/en/campaign-standard/using/managing-processes-and-data/data-management-activities/external-api.html Though it's limited in json format. Thus you may need something in between converting it to the actual json body format needed