> For tax and reporting reasons alone, payments practically need to be bound to a given transaction/receipt number. Cash doesn't work like that, so some countr

> For tax and reporting reasons alone, payments practically need to be bound to a given transaction/receipt number. Cash doesn't work like that, so some countries might not require this link even for some cashless payments. Heck I receive money transfers in EU and US that don't have any numbers in them, and they're not $2.