{"policy":"operator_review","summary":"Verified overpayments and failed paid executions are recorded for operator refund review; automated refunds are not performed.","overpayment_handling":{"accepted":true,"service_execution":"runs once when the transfer satisfies the required price","review_signal":"payment_context.overpayment_units"},"duplicate_transaction_handling":{"same_payment_identifier":"returns cached result","different_payment_identifier":"rejected with HTTP 402"},"refund_asset":"Base USDC","human_approval_required":true}