1. The consumption voucher of a credit card is the invoice or receipt in the user's daily consumption process, such as the invoice in a shopping mall, or the receipt after swiping the card at the POS machine. As long as the purchase is made using a credit card, these are all consumption vouchers belonging to the credit card. So it's fine for users to keep these.

2. It should be noted that no matter what kind of consumption voucher it is, it must match the consumption date, otherwise it will be considered by the bank as an invalid consumption voucher and needs to be re-provided.

3. There are many types of credit card consumption vouchers. Generally, as long as the cardholder uses the credit card for consumption in daily life, various vouchers provided by the merchant will suffice.