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You can cancel transactions on T day, whether or not the payment is successful. The purpose of the cancel interface, alipay.acquire.cancel, is to ensure the return of client funds or the termination of transactions with an unclear status.

撤销功能的目的是确保退回客户资金，或者终止状态不明确的交易。当天的交易，无论是否被支付成功，您都可以调用撤销接口。