Abstract: A mobile terminal converts token information corresponding to card information to a sound wave signal and transmits the sound wave signal to a magnetic field conversion device, and the magnetic field conversion device restores the token information from the received sound wave signal, converts the token information to a magnetic field signal, and transmits the magnetic field signal to a merchant terminal, to perform payment.

Abstract: In order to pay for a product, when a user places an order for a target product, a user terminal: receives, from a set-top box having obtained order information of the target product, a message for calling a target application installed in the user terminal; executes the target application on the basis of the calling; receives order details related to the order from a card company server; receives target card information for a payment from the user; and transmits the target card information to the card company server, and when the target card information is approved by the card company server, the payment for the target product is made.

Abstract: A face information registration method performed by a terminal may comprise: acquiring customer information corresponding to a user; extracting biometric feature data from a face image of the user; acquiring card information of the user; requesting user registration while mapping the customer information, the biometric feature data, and the card information and transmitting same to an authentication server; and in response to successful registration of the customer information, the biometric feature data, and the card information in the authentication server, receiving a result of the registration from the authentication sever.

Abstract: Provided are a method and system for payment when a network is blocked. A method of providing a remittance service performed by a first device, the method including requesting a financial institution system to issue a block key layer for at least a portion of an amount of money retained by a user of the first device, receiving the block key layer from the financial institution system in response to the request, receiving, from a second device, remittance request data for an amount of remittance, obtaining, from the received block key layer, a block key layer corresponding to the amount of remittance, and transmitting, to the second device, a file for the block key layer corresponding to the amount of remittance.

Abstract: A mobile terminal converts token information corresponding to card information to a sound wave signal and transmits the sound wave signal to a magnetic field conversion device, and the magnetic field conversion device restores the token information from the received sound wave signal, converts the token information to a magnetic field signal, and transmits the magnetic field signal to a merchant terminal, to perform payment.