Şablonu Getirir

var client = new RestClient("https://apitest.nilvera.com/evoucher/Templates/Download/22cdad9e-e9a3-4b6c-b9f5-d636a25396ad");
client.Timeout = -1;
var request = new RestRequest(Method.GET);
request.AddHeader("Authorization", "Bearer <API KEY>");
IRestResponse response = client.Execute(request);
Console.WriteLine(response.Content);