```\n       uint96 prefundingRefund = routing.funding + payoutSent_ - sold_;\n        unchecked {\n            routing.funding -= prefundingRefund;\n        }\n        Transfer.transfer(\n            routing.baseToken,\n            _getAddressGivenCallbackBaseTokenFlag(routing.callbacks, routing.seller),\n            prefundingRefund,\n            false\n        );\n```\n