because they signed a mail order agreement with the bank, they only need to provide the card type, card number, expiration date, cardholder's name, cardholder's valid ID number, cvv/cvc verification code and other information to apply for deduction from the bank. All credit card information is encrypted during transmission, which should be said to be safe. If you find that there is a problem with the deduction, contact Ctrip as soon as possible. It is very important to pay attention to the debit information of credit card bills and protect your credit card ~!