How do the barcode scanners know which barcode to read?
Sometimes this is a problem, and the simple solution is to cover all the barcodes but the store you’re at with your fingers. The better solution is to print this Just One Club Card windowed-sleeve cutout (PDF), cut it out, and construct a sliding, windowed sleeve for your new just one club card. If someone could turn this sleeve part into a quick instructable for me, I’d be very appreciative, just email me. Your sleeve should look something like this.
