chore: test barcodes in real life

[dargmuesli]

The barcodes' design was customized and is detectable by smartphone qr/barcode readers, at least in good lighting. Barcode scanners in supermarket scanners might have difficulties to detect the barcodes after all because of an issue like too little whitespace. Test if the current design works in supermarkets!

[Aluhut]

Let me know how to generate the code or how to get an card and I’ll give it a shot!