Support

Fix it on the review screen before you add the pass. If the pass is already in Wallet, tap it on Kardin's Home screen → Edit as new pass, correct it, and add the new one; then delete the old pass from Wallet.

Turn up the screen brightness and hold the iPhone flat to the scanner. If the original was an EAN-13 or another 1D barcode, Kardin re-encodes it as Code 128, which some tills don't accept; show the original card or ticket instead.

Try a sharper photo or screenshot with the whole code in view, or scan it directly with the camera. You can also type the code on the review screen, or leave the pass without one.

Tap the pass on Kardin's Home screen → Delete pass, and choose whether to also remove it from Apple Wallet. To remove it from Wallet only, open it in Wallet, tap the More button, then Remove Pass.

Creating a pass needs an internet connection, because it's signed on Kardin's server. Check your connection and try again; passes already in Wallet keep working offline.