XML Requests are for primary or secondary transactions. The term mains means all sales transactions, while the secondary ones are those that are related and directly related to an existing, previous transaction (eg returns, cancellations, etc.).
XML Requests in VPOS are for both XML and Redirect merchants. For Direct it is possible to make both groups of transactions using the XML channel, while for Redirect only minor transactions are allowed.
The following are some examples of such requests.