/// <summary>
        /// Obtain a new access token using a refresh token
        /// </summary>
        /// <param name="Models.CreateRefreshTokenInput">Object containing request parameters</param>
        /// <param name="fieldParameters">Additional optional form parameters are supported by this endpoint</param>
        /// <return>Returns the Models.OAuthToken response from the API call</return>
        public Models.OAuthToken CreateRefreshToken(Models.CreateRefreshTokenInput input, Dictionary <string, object> fieldParameters = null)
        {
            Task <Models.OAuthToken> t = CreateRefreshTokenAsync(input, fieldParameters);

            APIHelper.RunTaskSynchronously(t);
            return(t.Result);
        }
        /// <summary>
        /// Obtain a new access token using a refresh token
        /// </summary>
        /// <param name="Models.CreateRefreshTokenInput">Object containing request parameters</param>
        /// <param name="fieldParameters">Additional optional form parameters are supported by this endpoint</param>
        /// <return>Returns the Models.OAuthToken response from the API call</return>
        public async Task <Models.OAuthToken> CreateRefreshTokenAsync(Models.CreateRefreshTokenInput input, Dictionary <string, object> fieldParameters = null)
        {
            //the base uri for api requests
            string _baseUri = Configuration.BaseUri;

            //prepare query string for API call
            StringBuilder _queryBuilder = new StringBuilder(_baseUri);

            _queryBuilder.Append("/iisadasdjadasodisd0-2394-023jalskasdasd");


            //validate and preprocess url
            string _queryUrl = APIHelper.CleanUrl(_queryBuilder);

            //append request with appropriate headers and parameters
            var _headers = new Dictionary <string, string>()
            {
                { "user-agent", "APIMATIC 2.0" },
                { "accept", "application/json" },
                { "Authorization", input.Authorization }
            };

            _headers.Add("gfdsfkl", Configuration.Gfdsfkl);
            _headers.Add("dsfsdf", Configuration.Dsfsdf);

            //append form/field parameters
            var _fields = new List <KeyValuePair <string, Object> >()
            {
                new KeyValuePair <string, object>("grant_type", "refresh_token"),
                new KeyValuePair <string, object>("refresh_token", input.RefreshToken),
                new KeyValuePair <string, object>("scope", input.Scope)
            };

            //optional form parameters
            _fields.AddRange(APIHelper.PrepareFormFieldsFromObject("", fieldParameters, arrayDeserializationFormat: ArrayDeserializationFormat));
            //remove null parameters
            _fields = _fields.Where(kvp => kvp.Value != null).ToList();

            //prepare the API call request to fetch the response
            HttpRequest _request = ClientInstance.Post(_queryUrl, _headers, _fields);

            //invoke request and get response
            HttpStringResponse _response = (HttpStringResponse)await ClientInstance.ExecuteAsStringAsync(_request).ConfigureAwait(false);

            HttpContext _context = new HttpContext(_request, _response);

            //Error handling using HTTP status codes
            if (_response.StatusCode == 400)
            {
                throw new OAuthProviderException(@"OAuth 2 provider returned an error.", _context);
            }

            if (_response.StatusCode == 401)
            {
                throw new OAuthProviderException(@"OAuth 2 provider says client authentication failed.", _context);
            }

            //handle errors defined at the API level
            base.ValidateResponse(_response, _context);

            try
            {
                return(APIHelper.JsonDeserialize <Models.OAuthToken>(_response.Body));
            }
            catch (Exception _ex)
            {
                throw new APIException("Failed to parse the response: " + _ex.Message, _context);
            }
        }