The 3D Secure authentication protocol is based on a merchant performing the authentication prior to a charge. Since, essentially, PCI Booking is performing the 3DS authentication on your behalf, we have provided the following set of methods to create, retrieve and manage the 3DS merchants that you will need to use when performing authentication.
You can store in PCI Booking merchant information for as many of your customers as you need.
Once the merchant information for your customers is all set in PCI Booking, you will be able to start using the 3DS Sessions methods for performing the authentication.