Save as Draft

var client = new RestClient("https://apitest.nilvera.com/einvoice/Sale/ea047f3a-009f-4811-bf3c-eb87207552cd/CreateDraft");
client.Timeout = -1;
var request = new RestRequest(Method.POST);
request.AddHeader("Authorization", "Bearer <API KEY>");
request.AddHeader("Content-Type", "application/json");
var body = @"{"UUID": "3fa85f64-5717-4562-b3fc-2c963f66afa6","Phone": "string"}";
request.AddParameter("application/json", body,  ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
Console.WriteLine(response.Content);