2. Usually, the duration of supermarket shopping cards is relatively long, 1 to 3 years is more common, and there is another 5 years. The validity period of the Wal-Mart supermarket shopping card is three years from the date of issuance. If you accidentally put the card in the expired one, don't just throw it away. That would be a waste. We can apply for an extension of the card voucher, so that we can continue to use this expired shopping card. Wal-Mart supermarket only needs us to bring the expired shopping card and then go to the service desk of Wal-Mart supermarket to handle it, so the validity of the card voucher can be extended for half a year.