A method includes: receiving, from a manufacturer, a first printed document including specifications for a product and a first encoded image; sending, to the manufacturer, a second printed document, wherein the second printed document includes a second encoded image; receiving, from the manufacturer, a third printed document that corresponds to revisions to the specifications and includes a third encoded image; scanning the third encoded image; determining, based at least on scanning the third encoded image, that the third printed document corresponds to at least one of the first printed document or the second printed document; and in response to determining that the third printed document corresponds to at least one of the first printed document or the second printed document, making the product in conformance with the specifications.