1. A method comprising: a computer-based system receiving purchase data relating to a purchase of an item by a user, wherein the purchase data includes a retailer-assigned identifier for the item; the computer-based system associating a manufacturer-assigned identifier with the retailer-assigned identifier, wherein the manufacturer-assigned identifier is different from the retailer-assigned identifier; and the computer-based system storing, in an account associated with the user, at least a portion of the received purchase data and the manufacturer-assigned identifier.