The optional modules can be installed only on the latest version of the Online Booking Manager products.
Please upgrade first your license version if it is the case.
Required only for the European Union member countries.
Check it here
Want to drive more incremental direct bookings from the world’s largest travel site?
PCI-DSS Compliance via Online Payment Gateways (Online Payment Processor)
With OBM Facebook interface you can embed OBM Booking Engine in your Facebook page.