Single Sign On help

[spalx]

Hi guys,

I've been trying to generate a single signon request in whmcs using Oauth2, hence as i am new to this, i have been hitting a new brick wall with every request. I contacted support and they adviced me to use oauth/singlesignon.php which doesnt even exist in the docs and i have no idea what to send to that file. The standard client_id, request_type, scope, etc. request doesnt work or at least i get nothing in return. I have created a user/secret combo with a CreateOAuthCredential API call, and here is what i've been sending so far:

https://www.mydomain.com/oauth/singlesignon.php?client_id=IDHERE&response_type=code&scope=clientarea:profile&redirect_uri=RETURNURI&state=2j1d98183eh72w8h1e

This returns an empty json response. If i send the request towards oauth/authorize.php i get "The grant type is unauthorized for this client_id". Can you please give me a hint at what i'm doing wrong or at least point me in the right direction ? Thank you.