C# Example

var url = "https://txnhog.co/txn/api/your_message_key";
​
var httpRequest = (HttpWebRequest)WebRequest.Create(url);
httpRequest.Method = "POST";
​
httpRequest.ContentType = "application/x-www-form-urlencoded";
​
var data = "apiKey=sdkrjwhaldkgh3pwdfohawp4lyu&name=Shawn%20Spencer&phone=2085559988";
​
using (var streamWriter = new StreamWriter(httpRequest.GetRequestStream()))
{
   streamWriter.Write(data);
}
​
var httpResponse = (HttpWebResponse)httpRequest.GetResponse();
using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
{
   var result = streamReader.ReadToEnd();
}
​
Console.WriteLine(httpResponse.StatusCode);