Abstract: A method of reserving and completing purchases includes transmitting, by a first computing device, a payment authorization code to a second computing device, the payment authorization code associated with an order placed by a user of the second computing device. The method includes receiving, by a transaction management component executing on a third computing device, the payment authorization code from the second computing device. The method includes requesting, by the transaction management component, from the user, a payment to complete the order within a time period. The method includes determining, by the transaction management component, that the user provided the requested payment within the time period. The method includes instructing, by the transaction management component, a retailer transaction management component executing on the first computing device to fulfill the order, responsive to the determination.