Best performance is achieved when you increase your display brightness and scanning occurs with iPhone held away from  ambient light glare.

You can arrange the order of your Stores in the Edit screen.  This is done manually to allow you to maintain your favorites at the top or to set stores alphabetically.

Can't match your barcode?  Some reward cards like those from Wegman's and Shopper’s Drug Mart don’t show your full account number. You can get around this by either having your card scanned at the store and asking for the full account number or, as one clever iRewardCards user figured out, scan your card with your computer’s camera and use a utility like Delicious Library to reveal your full account number.  Alternatively, you can click here to upload an image of your card and have it decoded.  Once you have your full account number, enter it into iRewardCards to render your high resolution replica.

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When matching your barcode on the web, the default size is medium.  Select the largest size that your iphone will accommodate in the landscape position.  iRewardCards will automatically scale your image if its is larger than the display width.  For best results, avoid having your image scaled.  Click here to view samples.