1. Back of check card: Usually, the face value of the gift card will be printed on the back of the card. You can flip the shopping card and look for the number or denomination mark on the card.
2. Consult the staff of Du Ming Supermarket: If you can't find the face value information on the card, you can go to the customer service or consulting counter of Du Ming Supermarket and ask the staff about the face value of the card.