¿How i launch with API REST a process previously created into Bonita Studio?

Hi !,
I have created an workflow diagram into bonita studio , and now i want to start this process using API REST.

Regards.

To test a process using REST in Studio do the following:

Open Studio
goto Server->Open Portal

You MUST do the above first to start the server, then you can test your REST call to the server. In my case it’s

http://localhost:8080/bonita

regards
Seán

i know, but how i start a process , using a button in my personal page, in bonita documentation is there information about , how i start a case or how i obtain the case information, but i want to launch or start a process, when i press the button. i saw that for start a case for example i have to get the processDefinitionId, so how i obtain it , if the process still has not begun , really i’m very confused.

Regards.