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I’m having something like this for a copy-shop in a pop 200k city. In 2020. Not an account number, and essentially a manual debit account. The owner has a book with balances of people who pre-paid, when you print something, he looks you up in his book, edits in the new balance and then edits the balance on a piece of paper I have :)

Mailboxes, Etc. used to do something similar. They had a card to pre-pay for 100 discounted copies that you could then use at your leisure. The clerk punched a hole for every copy you made.

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