Using curl in c#?

I'm trying to use the square connect api with c#
I'm getting the following error.

"The remote server returned an error: (401) Unauthorized."

 
  Open your favorite command-line application (such as Terminal if you're using a Mac) and run the following curl command, providing your access token where indicated:

    curl -H "Authorization: Bearer PERSONAL_ACCESS_TOKEN" https://connect.squareup.com/v1/me/payments

    The -H option adds a header to your HTTP request with the format specified in quotation marks. This header is required for all requests you make to the Connect API.

    When the curl command returns, it prints JSON output representing your payment history (up to the 2000 most recent payments). If you haven't taken a Square payment yet, the output is simply an empty array, [].

Nice work, you've successfully downloaded your payment history with the Connect API.

Here is my code, any ideas?

WebRequest request = WebRequest.Create("https://connect.squareup.com/v1/me/payments");
request.ContentType = "application/json";
request.Method = "GET";
request.Headers("Authorization") = "XXXXX";

HttpWebResponse response = null;
string responseMessage = null;
response = (HttpWebResponse)request.GetResponse();

if (response.StatusCode == HttpStatusCode.OK) {
    using (Stream stream = response.GetResponseStream()) {
    using (StreamReader reader = new StreamReader(stream)) {
        responseMessage = reader.ReadToEnd();
        }
    }
}

Assert.IsNotNull(responseMessage);

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