Code of Civil Procedure Article 516

The debtor may file with the issuing court an objection to the payment order in whole or in part without stating the reason therefor within the peremptory period of twenty days following the service of the payment order.The debtor may withdraw the objection prior to a successful mediation or the conclusion of the oral argument in the first court instance, but shall bear the mediation expenses or litigation expenses.
中文原文 民事訴訟法第516條
債務人對於支付命令之全部或一部,得於送達後二十日之不變期間內,不附理由向發命令之法院提出異議。
債務人得在調解成立或第一審言詞辨論終結前,撤回其異議。
但應負擔調解程序費用或訴訟費用。

English translation for reference only; the Chinese text prevails. Not legal advice.