RestSharp

var client = new RestClient("http://blizzcmsv2.fixcore.fx/api/ApiAccount/user/5"); //this is my website url
var request = new RestRequest(Method.GET); //method
request.AddHeader("authorization", "Basic MYCREDENTIAL"); //this is my credential
request.AddHeader("x-api-key", "MYCODE@123"); //this is my Api key
request.AddHeader("content-type", "multipart/form-data; boundary=---011000010111000001101001");
IRestResponse response = client.Execute(request);
CURLcode ret = curl_easy_perform(hnd);