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> A credit card is also bidirectional ...

From a card holder's perspective regarding a transaction being voided or refunded, sure. What I was talking about are services where the account holder can equally perform purchases as well as receive payments.

> I meant to mention Zelle and Plaid too, since they integrate with many (most?) banks already to allow transfers via your online account login authentication credentials instead of traditional ACH

For the purposes of bidirectional fund transfers, the mechanism for how it is implemented is moot. The net effect and account access (intimacy) is functionally the same.



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