Since most doors don't open without a registered implant, it would require specific circumstances. In cases of outside vendors like food trucks, they wouldn't be able to tell there wasn't an implant. If someone ordered food, and they couldn't send the invoice (see below), they'd assume there was no funds to cover what was ordered.
As far as payment, invoices are sent to personal IDs with the request to withdraw funds. Invoices can come in many different fashions, but they aren't unlike visual QR codes. There isn't really "scanning" per se, but requests depending on the transaction. There are all kinds of ways for people to set this up through different accounts, banks and apps according to convenience. Due to privacy issues, much like credit card transactions now, if an invoice failed to send, a vendor wouldn't know why. Just that it failed. They'd just assume there's not enough to cover it.
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Since most doors don't open without a registered implant, it would require specific circumstances. In cases of outside vendors like food trucks, they wouldn't be able to tell there wasn't an implant. If someone ordered food, and they couldn't send the invoice (see below), they'd assume there was no funds to cover what was ordered.
As far as payment, invoices are sent to personal IDs with the request to withdraw funds. Invoices can come in many different fashions, but they aren't unlike visual QR codes. There isn't really "scanning" per se, but requests depending on the transaction. There are all kinds of ways for people to set this up through different accounts, banks and apps according to convenience. Due to privacy issues, much like credit card transactions now, if an invoice failed to send, a vendor wouldn't know why. Just that it failed. They'd just assume there's not enough to cover it.
Let us know if there are any questions!