Moodle API - accepted input format

Hi all,

I am currently working on the implementation of the Moodle API. 

For testing purposes and for further development, I would like to know what formats are supported by the API in input.

I have seen from the tests that we can request in get via query params, but when we want to send data, what format can we use?

Via postman, I managed to post data via `form-data` and `x-www-form-urlencoded` but can we also send JSON directly? 

I tested but for the moment without success.

thanks in advance.