/// <summary>
        /// Begin a new asynchronous WithdrawChallengeRequest
        /// </summary>
        /// <param name="requestData"></param>
        /// <returns></returns>
        public async Task <WithdrawChallengeResponse> WithdrawChallengeRequestAsync(WithdrawChallengeRequest requestData)
        {
            var res = await Requestor.PostStringAsync(Urls.WithdrawChallengeRequest, JsonHelper.SerializeData(requestData));

            return(JsonConvert.DeserializeObject <WithdrawChallengeResponse>(res.ResponseJson));
        }
 /// <summary>
 /// Begin a new WithdrawChallengeRequest
 /// </summary>
 /// <param name="requestData"></param>
 /// <returns></returns>
 public WithdrawChallengeResponse WithdrawChallengeRequest(WithdrawChallengeRequest requestData)
 {
     return(JsonConvert.DeserializeObject <WithdrawChallengeResponse>(Requestor.PostString(Urls.WithdrawChallengeRequest, JsonHelper.SerializeData(requestData)).ResponseJson));
 }