Could we have the option to give customers a digital card. Seeing as a QR code or barcode is essentially just an image as far as the scanner is concerned.

I have a photo of my tesco's club card as there's no signal in the store to load the app, a bodge that works.

A more elegant solution for customers would be adding their rewards card to their google/apple wallet on their phones. Saves us time at the checkout too

Saves the cost and waste of plastic reward points cards.