I want to learn a couple of things about the API so I did a VERY primitive test. I created a couple of plain HTML forms through which I manually catch the Access Token. Which I then manually put in other forms. This works perfectly OK for READ calls, I can list all leads, search for a lead, list users, etc. This all works (i.e I am catching the Access Token OK, the API is enabled etc etc)
But when trying any WRITE action, it returns a blank JSON with an error 400 code and nothing gets written.
This is the form I am trying (again, I change the Access Token so that is not the problem)
Is this approach theoretically possible?
Any ideas what is wrong with this POST?
Many, many thanks!