CURL API, how to enter details

Hi,
I have found a PDF API which is apparently very easy.
This is what they have provided me with. I am having difficulty entering the info into Wappler in the API server action.

Any assistance would be very much appreciated.

Screen Shot 2022-06-18 at 1.29.01 am822×662 62.6 KB

Screen Shot 2022-06-18 at 1.30.20 am864×1070 48.8 KB