Converting Debit Card Numbers to Bank Account Numbers

Is there a service out there that can convert debit card numbers to the associated bank account number, or is this proprietary tech they are building?

“At checkout, kevin.'s software identifies the related bank account after the customer types in the first eight digits of their card number.”

[Lithuanian startup kevin. bids to cut out card networks at the checkout](https://Article about Kevin - Fintech Startup)

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