You can add a cookie in a native REST microflow.
Add a HttpResponse as a parameter to the microflow
Add a Create action, and create a System.HttpHeader.
Set the following:
If you want to add to existing cookies, you have to get the existing cookie header and set value to <existing value>; <your value>
Joost, Thanks for the direction but I still get a 401-not authorized. What did I misunderstand?
You suggest to add HTTPResponse as a parameter to my microflow, it's an empty object in this case. Then I associated the created header to this response...although I was wondering shouldnt i link the cookie to a request..rather than a response...
Edit 27-6: In the end this did the job: Thanks Joost & Austin