I need to create tests using RestAssured - Java for testing REST API. In order to get an authentication token (OAuth 2.0), I need to send from postman request filled as in the screen below. However, in java tests, I can not use postman. Any idea how it should look like java code to get authentication token? 

[![enter image description here](https://i.stack.imgur.com/yajt1.png)](https://i.stack.imgur.com/yajt1.png)