Brings Mail Transaction History

var client = new RestClient("https://apitest.nilvera.com/earchive/Invoices/2e58440f-9a81-49f3-8b82-7321265fa2f0/Mailhistories");
client.Timeout = -1;
var request = new RestRequest(Method.GET);
request.AddHeader("Authorization", "Bearer <API KEY>");
IRestResponse response = client.Execute(request);
Console.WriteLine(response.Content);