What is the exchange path of physical exchange between Party A and Party B?

A series of links or steps experienced by both parties in the process of physical exchange. In the physical exchange, both parties need to transfer and exchange goods through the exchange path. It usually includes the following links: finding the exchange object, negotiating the exchange conditions, confirming the quality of goods, determining the exchange time and place, realizing the exchange of goods, and confirming the completion of the transaction.