//define somethings we'll need for the api
string apiEndpoint = "https://api.cloudflare.com/client/v4";

//user info here
string userEmail = "youremail@something.com";

//this is your Global api key found in "my account"
string userAPIkey = "xxxxxxxxxxxxxxxxxxxxxxxxx";

//domain your working with:
string domain = "http://www.yourdomain.com";

//let's get our zone ID (we'll need this for other requests
HttpWebRequest request = WebRequest.CreateHttp(apiEndpoint + "/zones?name=" + domain + "/&status=active&page=1&per_page=20&order=status&direction=desc&match=all");
request.Method = "Get";
request.ContentType = "application/json";
request.Headers.Add("X-Auth-Email", userEmail);
request.Headers.Add("X-Auth-Key", userAPIkey);

string srZoneResult = "";
using (WebResponse response = request.GetResponse())
using (var streamReader = new StreamReader(response.GetResponseStream()))

	srZoneResult = (streamReader.ReadToEnd());

dynamic zoneResult = JsonConvert.DeserializeObject(srZoneResult);

if (zoneResult.result != null)
{
	//get our zoneID
	string zoneId = zoneResult.result[0].id;

	//some pages to purge the cache on:
	byte[] data = Encoding.ASCII.GetBytes(@"{""files"":[""http://www.yourdomain.com/about/""]}");

	request = WebRequest.CreateHttp(apiEndpoint + "/zones/" + zoneId + "/purge_cache");
	request.Method = "DELETE";
	request.ContentType = "application/json";
	request.ContentLength = data.Length;

	request.Headers.Add("X-Auth-Email", userEmail);
	request.Headers.Add("X-Auth-Key", userAPIkey);

	using (Stream outStream = request.GetRequestStream())
	{
		outStream.Write(data, 0, data.Length);
		outStream.Flush();
	}

	string srPurgeResult = "";
	using (WebResponse response = request.GetResponse())
	using (var streamReader = new StreamReader(response.GetResponseStream()))

		srPurgeResult = (streamReader.ReadToEnd());

	dynamic purgeResult = JsonConvert.DeserializeObject(srPurgeResult);

	//was it a success (hopefully it = true)
	textBox1.Text = purgeResult.success;
}