Hello, how do I buy some tickets and do not count the confirmation number?

Check the email

In the agency that they were bought, perhaps by email they gave you the key. You go to the park's customer service (at the entrance) and there they help you and give you the access cards.

I bought them at the same travel agency and had the boucher already printed. I had no problem. I think you can call the Park itself and there they could guide you on what you should bring to present at the entrance.