The reason is because their are quite a few financial transaction / banking networks through which these items are routed. As many of these began as regional "home grown" systems, there are many integration issues.
The type of transaction determines the routing and settlement sequence. Debit transactions are generally interbank, not requiring a path through the Visa net (unless one does the signature based debit). I try to avoid signature based debit because VISA screws the merchant with extraordinarily high fees on this transaction type.
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