http://en.wikipedia.org/wiki/Procurement_PunchOut

Procurement PunchOut is a term that defines the electronic communication protocol between a vendor's web storefront and a buyer's procurement application. The buyer leaves ("punches out") from their company's system and goes to the supplier's web-based catalog to locate and add items to their shopping cart, while their application transparently maintains connection with the web site and gathers pertinent information. A vendor catalog, enhanced for this process, is known as a punchout catalog. PunchOut enables communication between the software and the web site so that relevant information about the transaction is delivered to the appropriate channels.[1] Sometimes, buyers and suppliers use intermediaries to ensure authentication and version matching.

Quizás se pueda traducir como "conexión al catálogo de los vendedores".