An electronic image that includes information related to a pharmacy prescription of a user of a first account (e.g., a store account) is received from a client device. The pharmacy prescription information is electronically extracted from the electronic image, and a second account (e.g., a pharmacy account) is identified based thereon. Additional authentication information is received from the client device (sometimes in response to a prompt for additional information based on information contained in the first or second accounts), and the first and second accounts are linked if the additional authentication information is consistent with the user.