Capture is the instruction that tells a merchant's acquirer to collect an amount the issuer has already approved. Before it is sent, the sale exists only as a reservation on the cardholder's balance; after it, the transaction joins a batch and starts moving toward the merchant's account.
What is capture in a payment flow?
The capture definition is narrow: it is a collection instruction against an existing approval, not a payment in its own right. A capture message carries the original approval reference, the amount and the currency, and it lands in the day's file rather than being processed on its own. At the acquirer's cut-off that file goes into clearing, which is why the clock matters more than the calendar: an instruction sent ten minutes after cut-off waits for the next round of batch processing and reaches settlement a full business day later.
The everyday capture meaning is looser — merchants say a payment was captured when they mean the money is on its way — but nothing has actually moved until that file clears.
Taking less than was approved
Most acquirers accept a collection below the approved figure. The difference is released back to the cardholder's available balance, though some issuers hold it until the original approval expires — which is why a customer can see a 340 euro hold and a 210 euro charge side by side for a couple of days.
The arithmetic on a split shipment
A basket of 340 euros is approved as one amount. Two items ship on Monday for 210 euros and the third ships on Thursday for 130 euros. Where the acquirer supports multiple collections against one approval, both go through and total exactly 340. Where it does not, Monday closes the approval and Thursday's 130 euros needs a fresh one, against a card that may by then be expired, blocked or short of funds. That single acquirer capability decides whether a partial-shipment retailer loses a slice of revenue every month.
Taking more than was approved
Over-collection is restricted. Gratuity categories such as restaurants and taxis carry a limited tolerance above the approved figure; outside them, anything higher needs a new approval. Businesses with unpredictable totals therefore approve high and collect down, never the reverse.
What lateness costs
Collecting after the approval has lapsed is often still accepted, and it is expensive. The transaction can be downgraded to a worse interchange rate, and it carries weaker evidence in a dispute because the issuer's guarantee has gone. Reauthorizing is the fix; how long a business should leave that gap open at all is the subject of authorization and capture.
Undoing it
Beforehand, a void erases the transaction and the customer sees nothing. Afterwards the only route back is a refund, with its own fee and its own line on the statement.