With the “my at” account you can buy tickets through the app, save your favorite routes, and receive alerts about the lines you use most. You can also access My at from the website.
With the “webshop” profile, instead, you can request concessions and buy season tickets (for both adults and minors).
Note: my at and webshop are two separate accounts. You can use the same credentials, but if you reset your password you’ll need to do it separately for each profile, and the new password will only apply to the system where you requested the reset.