An account to account transfer (A2A) moves value straight between two bank accounts on a bank rail, with no card, no issuer and no card network in the middle. The payer's bank debits one account, the beneficiary's bank credits the other, and the two banks square up with each other inside the scheme they both belong to.
Two ways an A2A payment starts
Either the payer pushes, or the collecting company pulls. A push is a manual bank transfer or, more often now, an open banking payment: checkout hands the customer into their own banking app, where a pre-filled instruction waits for approval. A pull runs against a stored authorization, which is the territory of direct debit — mandates, notice periods and refund rights behave nothing like a push and are covered there.
Which rail carries the instruction is a separate question again. SEPA carries euro transfers, the automated clearing house carries US batches, and each sets its own timing.
Who carries the loss when it goes wrong
A completed push transfer has no chargeback behind it. That removes dispute exposure for the merchant and removes the recourse buyers are used to on cards. Fraud therefore concentrates on tricking the payer into authorizing the payment personally, and who reimburses that varies sharply by country.
The ticket size where A2A beats cards
A2A pricing is normally a flat amount per transaction, because no interchange and no scheme percentage sit inside it. Against a card payment charged as a percentage of value, the saving grows with the ticket. On a 20 dollar order the difference is noise; on a 4,000 dollar order it is real money, which is why high-value goods, rent collection and B2B invoicing moved first.
The mistake that surfaces in reconciliation
Teams treat a transfer as done the moment the customer sees a confirmation screen in their banking app. On instant rails that is close to true. On batch rails the funds are still in flight, and releasing goods against an unconfirmed credit is how merchants get burned — which is why settlement delay belongs in the fulfillment logic and not only in the finance report.
Markets where ignoring A2A costs volume
In Brazil, the Netherlands, Poland and much of Asia, domestic bank rails reached ubiquity before cards did, and customers reach for them by default. A merchant entering those markets with cards alone is not declining to offer an alternative payment method; it is missing the main one.