You can integrate VIP authentication with your client applications using VIP User Services. Your client application uses SOAP Web Services to send a User ID and security code to the VIP User Service. VIP User Services obtains the credential ID, and then authenticates the credential ID and security code with VIP Authentication Services. With VIP User Services, you maintain the user database (user IDs and passwords) and VIP User Services manages the user ID to credential ID mapping.
This guide tells how to build a SOAP Web Services interface between VIP User Services and your client application. This guide is also available online.