Hi, I am trying to use OpenID Connect Authorization Code Flow but am unable to obtain the token using the token endpoint for user authentication with Gluu as the OP provider. https://idp.centroxy.com/oxauth/restv1/token While trying the same using Google as the provider, the token is obtained successfully. I added response types as code. I added scopes as openid and profile. I added Grant Types as client_credentials and redirect_uri as created in my client application. I added code as obtained by the authorization_endpoint. But while sending post request using Postman, I get: {     "error": "invalid_request",     "error_description": "The request is missing a required parameter, includes an unsupported parameter or parameter value, repeats a parameter, includes multiple credentials, utilizes more than one mechanism for authenticating the client, or is otherwise malformed." } Please check the attachment for the Postman screenshot. But as per oxAuth log file 2018-03-12 12:22:50,136 INFO  [qtp212628335-14] [org.xdi.oxauth.auth.Authenticator] (Authenticator.java:217) - Authentication success for Client: '@!A531.9F38.8347.F83D!0001!3806.151C!0008!DDAB.475E' I searched similar kind of issues in Support Portal but no luck. Is there anything wrong I am doing ? Kind Regards, Jajati