Using https://railcomm.auth0.com/oauth/ro?client_id=xxxxxxxxxxxxxPyGQhNWFnGi0RRCCMB92nLd&username=jsheehan@railcomm.com&password=xxxxxxxx leads to:
{
"error": "invalid_request",
"error_description": "missing username parameter"
}
Using https://railcomm.auth0.com/oauth/ro?client_id=xxxxxxxxxxxxxPyGQhNWFnGi0RRCCMB92nLd&username=jsheehan@railcomm.com&password=xxxxxxxx leads to:
{
"error": "invalid_request",
"error_description": "missing username parameter"
}
The URL you mentioned would be suitable if the endpoint supported a GET request.
However, the /oauth/ro endpoint requires the following:
POST request.For reference information see: Authentication API Explorer