For whatever reason, when I run tests in postmark, I am getting error 404. Almost every time. 3 times it happened it was successful, without changing anything. What could cause this?
Actually, the problem was quite stupid. When I wanted to detect call, I clicked detect data, copied the link, closed the popup and tried to initiallize the call.
My mistake was that I should have kept the DETECT DATA popup open in order to detect data.