Depending on the country it’s not that easy. Maybe something changed in the meantime but where I am those blocks are prefilled-numbered and stock needs to be co

Depending on the country it’s not that easy. Maybe something changed in the meantime but where I am those blocks are prefilled-numbered and stock needs to be controlled. It’s not like you can (could?) keep a block „just in case” and thus many shopkeepers wouldn’t even bother in case of outages. Depending where you live a good old trust can be a currency. Humans are great when it comes to adaptation, I bet I could just write on paper name, CC number and leave it on a paper for shopkeeper and everything would resolve just fine..