/// <inheritdoc/>
        public override UserAccess GetUserAccess(CloudIdentity identity, bool forceCacheRefresh = false)
        {
            if (identity == null)
                throw new ArgumentNullException("identity");

            CloudIdentityWithProject identityWithProject = identity as CloudIdentityWithProject;
            if (identityWithProject == null)
            {
                if (identity.GetType() != typeof(CloudIdentity))
                    throw new NotSupportedException(string.Format("{0} does not support credentials of type {1}", GetType().Name, identity.GetType().Name));
            }

            Func<UserAccess> refreshCallback =
                () =>
                {
                    JObject credentialsObject;
                    if (!string.IsNullOrEmpty(identity.APIKey))
                    {
                        credentialsObject = new JObject(
                            new JProperty("apiAccessKeyCredentials", new JObject(
                                new JProperty("accessKey", identity.APIKey),
                                new JProperty("secretKey", identity.Password))));
                    }
                    else
                    {
                        credentialsObject = new JObject(
                            new JProperty("passwordCredentials", new JObject(
                                new JProperty("username", identity.Username),
                                new JProperty("password", identity.Password))));
                    }

                    JObject authObject = new JObject(credentialsObject);
                    if (identityWithProject != null && identityWithProject.ProjectId != null)
                        authObject.Add("tenantId", JToken.FromObject(identityWithProject.ProjectId));
                    if (identityWithProject != null && !string.IsNullOrEmpty(identityWithProject.ProjectName))
                        authObject.Add("tenantName", JToken.FromObject(identityWithProject.ProjectName));

                    JObject requestBody = new JObject(
                        new JProperty("auth", authObject));

                    var response = ExecuteRESTRequest<JObject>(identity, new Uri(UrlBase, "/v2.0/tokens"), HttpMethod.POST, requestBody, isTokenRequest: true);
                    if (response == null || response.Data == null)
                        return null;

                    JToken userAccessObject = response.Data["access"];
                    if (userAccessObject == null)
                        return null;

                    UserAccess access = userAccessObject.ToObject<UserAccess>();
                    if (access == null || access.Token == null)
                        return null;

                    return access;
                };
            string key = string.Format("{0}:{1}/{2}/{3}/{4}", UrlBase, identityWithProject != null ? identityWithProject.ProjectId : null, identity.Username, identity.APIKey, identity.Password);
            var userAccess = TokenCache.Get(key, refreshCallback, forceCacheRefresh);

            return userAccess;
        }