url = https://api.pay1.de/post-gateway/
enMethod = "POST"
body_data = "request=preauthorization&mid=46388&portalid=2033743&key=***&mode=test&aid=47514&currency=EUR&reference=f398a0da&clearingtype=cc&company=Bits4Soft&firstname=Thomas&lastname=Steinl&country=DE&cardexpiredate=2512&cardtype=M&pseudocardpan=9550010000685100854&amount=100&errorurl=https:/stage.tiimwork.de/Payment/Failed&backurl=http://localhost:44308/Payment/CreditCard&successurl=https:/stage.tiimwork.de/Payment/Success?ref=f398a0da&customerid=UserID1"

public static string GetWebResponse(string url, enMethod enMethod, string body_data = "" )
{
	string responseFromServer = "";
	string content_type = "application/x-www-form-urlencoded";
	//string user_agent = "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:83.0) Gecko/20100101 Firefox/109.0";
	string accept = "*/*";

	ServicePointManager.Expect100Continue = true;
	ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072 | SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls13 | SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;
	ServicePointManager.ServerCertificateValidationCallback = AcceptAllCertifications;

	var request = (HttpWebRequest)WebRequest.Create(url);
	request.ContentType = content_type;
	request.Method = enMethod.ToString();
	//request.UserAgent = user_agent;
	request.Accept = accept;
	request.KeepAlive = true;
	request.ServerCertificateValidationCallback = AcceptAllCertifications;

	if (!string.IsNullOrEmpty(body_data))
	{
		byte[] byteArray = Encoding.ASCII.GetBytes(body_data);
		request.ContentLength = byteArray.Length;
->		Stream newStream = request.GetRequestStream();
		newStream.Write(byteArray, 0, byteArray.Length);
		newStream.Close();
	}

	WebResponse response = request.GetResponse();

	using (Stream dataStream = response.GetResponseStream())
	{
		StreamReader reader = new StreamReader(dataStream);
		responseFromServer = reader.ReadToEnd();
	}

	response.Close();

	return responseFromServer;
}