What is the confirmation notice sent in Ctrip's order information?

Key points: After clicking, a prompt will pop up to send a short message and fill in the number. You will receive a short message after typing. The content of the message has a confirmation number. There is no need to reply to this Ctrip confirmation message. You can log on to Ctrip's website to check the status of your order. It is the reservation confirmation number between Ctrip and the hotel. If you arrive at the hotel as scheduled but can't find the order, you can provide the confirmation number to the hotel for verification.