post https://schoolpassport.gg4l.com/oauth/token
Endpoint Example Only!
This endpoint is for documentation purposes only - You can't test this endpoint without having an app to route the redirect_uri to.
The request must contain WWW BASIC authorization with client_id and client secret key in request header: ‘Authorization’: ‘Basic {data}’
where data = Base64.encode(‘{client_id}:{client secret}’)