Inheritance: Braintree.Request
        public ResultImpl<OAuthCredentials> CreateTokenFromRefreshToken(OAuthCredentialsRequest request)
        {
            request.GrantType = "refresh_token";
            XmlNode accessTokenXML = service.Post("/oauth/access_tokens", request);

            return new ResultImpl<OAuthCredentials>(new NodeWrapper(accessTokenXML), gateway);
        }
        public ResultImpl <OAuthCredentials> CreateTokenFromRefreshToken(OAuthCredentialsRequest request)
        {
            request.GrantType = "refresh_token";
            XmlNode accessTokenXML = service.Post("/oauth/access_tokens", request);

            return(new ResultImpl <OAuthCredentials>(new NodeWrapper(accessTokenXML), gateway));
        }