Methods and systems for producing shipping labels are provided. Example embodiments provide a Shipping Label Production System ("SLPS"), which produces shipping labels based on a shipping uniform resource identifier ("URI") that identifies a shipping protocol and includes shipment information and post-back information. The SLPS may be configured to produce, in accordance with the shipping protocol, a shipping label by outputting a shipping label based on the shipment information, and automatically posting information about the producing of the shipping label to a code module identified by the post-back information. In some embodiments, the actions of the SLPS may be initiated by a Web browser in response to a user selection of a shipping URI. This abstract is provided to comply with rules requiring an abstract, and it is submitted with the intention that it will not be used to interpret or limit the scope or meaning of the claims.