Check-in is the new service that makes mobile payments safer.
If you want to enable Check-In you must have a PayPal account and a credit card associated to it.
Once you are logged in the PayPal app you can click on "shopping " and browse through the list of the shops/resturants with iPratico POS Check-in: they are sorted by the distance from the user. When the user confirms payments his data appear on iPratico POS PRO.
Another feature is the ability to enter discounts and coupons. (Currently available only in UK)