Successful execution of the procurement process takes place via the exchange of documents through various transport mechanisms. Some methods are just digital copies of traditional paper-based documents. Others represent a true paradigm shift where the entire process has changed and can be seamlessly connected to other business systems. Some of the most common methods of exchanging data include API, EDI, cXML, and Flat Files via SFTP. It would be tempting to select a winner based on technical merits alone, but they each have their place depending on the capabilities and resources available to the actors.