private async Task <T> PostRequest <T>(RequestBase req)
{
var properties = req.BuildProperties() ?? new Dictionary <string, string>();
properties["access_key"] = _config.ApiKey;
properties["tonce"] = req.Timestamp.ToString();
properties["signature"] = Sign(req.BuildPayload(properties), _config.ApiSecret);
var content = new StringContent(req.BuildQueryStringFromParams(properties), Encoding.UTF8, "application/x-www-form-urlencoded");
var requestMessage = new HttpRequestMessage(req.Method, req.Url())
{
Content = content
};
var response = await _apiClient.SendAsync <T>(requestMessage);
return(Resolve(response));
}