Totally way OT from the original intention of the thread, but there is some interesting related info in the following Wikipedia articles:
Interchange fee
Acquirer
Acquiring bank
Issuing bank
Merchant account
Debit card
Also, here's a graphic that more or less shows the process:
Interchange fee
Acquirer
Acquiring bank
Issuing bank
Merchant account
Debit card
Also, here's a graphic that more or less shows the process:
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