A user device receives, from a server associated with a merchant, a menu of items offered for sale by the merchant. The menu permits a user, of the user device, to place an order associated with the merchant. The user device receives, from the server, information, associated with the order, that includes at least one item and a price associated with the item. The user device receives a user instruction to pay for the order and retrieves, from a memory associated with the user device, payment information to pay the price associated with the at least one item. The user device sends, to the server, the payment information to permit the server to process the payment information. The sending is performed in a manner that does not permit an attendant associated with the merchant to access the payment information. The user device receives an indication the payment information was processed.