I'm having trouble with Adobe Sign's OAuth authentication -- every time I try to get my access token with my Client ID and redirect URI, I get this message:
Unable to authorize access because the client configuration is invalid: invalid_request
This is the request that I have been making (with the proper substitution for REDIRECT and CLIENTID):
https://secure.echosign.com/public/oauth? redirect_uri=REDIRECT& response_type=code& client_id=CLIENTID& scope=user_login:self+agreement_send:account
I am fairly new to OAuth and don't understand what I'm doing wrong. Could someone please explain the issues that could result in this error message?