It is important to understand that these agreements must be verified by your company before being used to ensure that all items applicable to your particular environment are included (or excluded). A TPA defines how trading partners interact in transportation, document exchange and business protocol. A TPA contains the terms and conditions of the contract, the roles of participant (buyer, seller), communication and security protocols and business processes (valid actions, sequencing rules, etc.). papiNet offers a TPA (Trading Partner Agreement) model for your use in developing your own TPA when you start exchanging electronic documents between B2B partners. In the context of papiNet, the TPA thus defines a specific implementation of the papiNet standard between two parties.