XML Requests is used for primary or secondary transactions. The term primary means all financial (Sales/Preauthorization) transactions, while the secondary ones are those that are directly related to an existing, previous transaction (eg refunds, cancellations, status request etc.).

All merchants can use VPOS XML Requests. Merchants with Direct integration (PCI DSS certifired) can consume XML VPOS requests for both groups of transactions (primary and secondary), whilst merchants with Redirect integration can use them only for secondary transactions.