How to use API REST ?

I am new to the community.

I read the documentation:
http://documentation.bonitasoft.com/rest-api-overview

I have seen many examples of REST API in the community but since I can use the statements within the process BonitaStudio?

sorry for my english
Thanks for your help.

Hi.

There is an exemple here :
https://github.com/bonitasoft/bonita-examples/tree/master/rest-api-example

I try it with Bonita 6.3.7 Community but a lot of REST API doesn’t work with this version.