Documenting conditional POST requests for OAuth


Hey Guys,
I realize that the title might be a little bit confusing so here is what I am trying to achieve:
I need to document token_grant and token_refresh methods using RAML both of which are POST calls.

token_grant: generate the first time OAuth token
token_refresh: refresh the access token

They differ in different query parameters and of course different return results. The problem is they are both under the same resource:


Is there a way I can work around this, being limited to one post call?

Any help is appreciated
Thanks a lot!