Please refer to the documentation, what does it say?
It looks like form data to me, but I could be wrong since I’ve never used Stripe before.
For more information on how to use HTTP, see https://academy.make.com/courses/AdvancedC02
Hope this helps! Let me know if there are any further questions or issues.
— @samliew
P.S.: Did you know, the concepts of about 70% of questions asked on this forum are already covered in the Make Academy. Investing some effort into it will save you lots of time and frustration using Make later!