Api connector application/x-www-form-urlencoded error dynamic

I fixed mine by simply adding a header
Content-type : application/x-www-form-urlencoded
to the request while keeping the bubble body type picklist to JSON which saved me re-entering the parameters.

I also did that, but my tests where showing that it worked sometimes and not other times. As this is a very important api call for me, I reimplemented it