The following diagram illustrates a message exchange between two partners (your enterprise and your trading partner) using CPAs and TPAs. For this example, assume that your enterprise sends a purchase order to your trading partner, who responds with an ebXML acknowledgment.

Trading partners A and B negotiate a business arrangement and create a CPA. From the CPA, trading partner A creates two Trading Networks profiles (one for self and one for trading partner B) and a TPA. Trading partner B also creates two profiles (one for self and one for trading partner A) and a TPA from the same CPA. The TPA is identical for both trading partner A and B. If any security measure is required, trading partner A and trading partner B each configure certificates for the Trading Networks profiles. Trading partners A and B are now ready to trade.