Example embodiments provide a Shipment Preparation System (“SPS”), which facilitates the preparation of shipments, such as by producing shipping labels. In one embodiment, the SPS is configured to receive shipment preparation information from a bar code or other machine-readable data block in a packing list. The shipment preparation information identifies a uniform resource identifier (“URI”) that identifies a code module that is remote from the SPS. The SPS then communicates with the remote code module in order to obtain information for the preparation of the shipment and/or for transmission of information about the preparation of the shipment. Obtaining information for the preparation of the shipment may include receiving an address to use for printing a label. Transmitting information about the preparation of the shipment may include posting an indication that a label has been printed, a shipment is ready for pick up, or the like.