OAuth 2.0 API example with POST request

[lgaertner]

Hello, 

I am trying around with the Workfront API and I would like to successfully run a POST request. Unfortunately I always get

"method POST is not allowed for authorization type COOKIE"

in return. The only POST request which is working is the Login, although it does not work via OAuth 2.0 but via

{{base_URL}}/attask/api/v15.0/login?username={{username}}&password={{password}}

I am testing with Postman.

Is there any up to date manual somewhere?

Thanks in advance.

Regards

Lars