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If you need to cancel a transaction and it's a recent transaction, you can void the sale or credit.
When you void a sale, you cancel it entirely. It won't settle with the rest of the transactions, and will not be included in your monthly revenue share calculation.
Please note that you can only void transactions in a transaction that has not yet settled. Once a transaction has settled, your only option would be to issue a refund and have your customer place a new order.
Important note: There will only be a brief time period after an order has been placed to void a sale or credit. The time period will depend on the card used in the transaction and there is no specific time period in which you can void a sale or credit.