1: Airports generally have places to print physical ticket vouchers. If you don't print it before boarding, you can generally print the relevant documents on the website of the airline to which the flight belongs with your boarding pass or ticket purchase record.

2. Credit card certificates of deposit can be used as reimbursement vouchers. Most foreigners buy air tickets online, and foreign websites also accept credit card payment. Then you need a foreigner to go to his credit card website and print out the cost of the plane ticket you bought at that time, so you can reimburse it.

3. After the e-ticket is purchased successfully, you can print the reimbursement voucher at the airport, or you can print it at the agency when you buy the ticket and bring it back to China.