Idea: NFC receipts as an alternative to paper receipts

I don't want to give you my email address, but you encode the receipt data onto an NFC pad I can tap my phone to, we can save paper without giving you that oh-so-tasty data

@sir Can also provide a QR code or similar for any devices that don't have an NFC chip.

@OTheB @sir important: the QR code needs to encode the receipt itself, not a link to it

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@moonbolt @sir Absolutely. Main issue to target is if the QR codes get too big on large shopping trips. Data would need to be compressed as much as possible (using an open compression algorithm obviously) otherwise you end up with the same problem Matrix is currently having where verification using the new QR codes is really temperamental because the codes are huge.

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