A card use system includes a first client configured to send a card use request including card information of a card, and display a payment code including a first resource account number corresponding to the first client; a second client configured to send a payment request to transfer a first quantity of resources from the first resource account number to a second resource account number corresponding to the second client; a card server configured to validate the card according to the card information; and in response to successfully validating the card, send a confirmation indication to the payment server; and a payment server configured to, in response to receiving the confirmation indication from the card server, transfer a second quantity of resources in the first resource account number corresponding to the first client to the second resource account number corresponding to the second client.