QOAuth for authenticating a user

[Rizwan94]

i have a use case in which the user logs in to the desktop aapln and connects to the server.

the server returns a token which gets used for further requests and gets refreshed as required.

For this i am trying to use the oAuth workflow.
For my need it feels I have to use grant type " resourve owner password credential".

Can anybody help me with a minimal example on how to use it?
Also some pointers on this concept would be helpful.