Save your Library card in Stocard. GMPL currently recommends using this app as it is available for most devices. Download the App on your smartphone and start by adding a new card to the device. It's as simple as scanning a barcode. Save your card under GMPL. Now you can scan your smartphone on the self-check station! You can save all your reward cards on Stocard. No more digging through your wallet to find out whether or not you have one.