You will need an Internet connection for following functionalities:
for the first app start
to add/edit/request/delete a card
to update card pictures, offers and information
for bonus points query
for retailers and contact information
for links to websites/Facebook/online shops/etc.
for the storefinder
to update information about offers and coupons
to register an account
to log into your account
to enter and change your password
to read news and the terms of use
to pay with blue code, if you need new barcodes