Embodiments of the present invention provide methods, systems, and computer readable storage media to facilitate a transaction in an electronic commerce system. Aspects of the embodiments include receiving a request at a network-connected transaction server to transfer one or more transaction items involving a first user account on the transaction server, selecting a delivery instrument from one or more available delivery instruments associated with the first user account on the transaction server, authorizing the request based at least upon a unique transaction identifier associated with the request and a unique user device identifier associated with a user access device, transferring a quantity of the one or more transaction items into or out of the selected delivery instrument, wherein the quantity is determined at least based upon the authorized request.