Log in with the SwissPass login.
With the SwissPass login you can also log into the SBB Ticket Shop. The basis for this is a SwissPass account, which you can set up at www.swisspass.ch.
If you still do not have an SBB Ticket Shop account, a new Ticket Shop account will be set up based on your SwissPass user data. You then also have access to the SBB Ticket Shop with your SwissPass user data.
If you already have a Ticket Shop account, you will be asked to identify yourself with your Ticket Shop user data. You can then either log in to your existing Ticket Shop account with your SwissPass user data or with your current Ticket Shop access data.