Rules Governing the Administration of Electronic Payment Business Article 21

When an electronic payment institution refunds the payment funds received from a user, it shall, return the funds through the payment method originally used by the user, return into the user's original e-payment account, original stored value card, original deposit account or original credit card account.Except where the amount of the payment were originally paid by a user via a credit card, an electronic payment institution that is approved to engage in the business of accepting deposits of funds as stored value funds may convert the refunds specified in the preceding paragraph into stored value funds as agreed with the user, where the balance of stored value funds shall be in accordance with the provisions of Paragraph 1, Article 16 of the Act.Where an electronic payment institution is unable to carry out refunds according to the preceding two paragraphs, the institution shall request and be agreed by the user to provide his or her own deposit account, which may be used for the refund operation, and it may transfer the relevant refunds into the said deposit account without making the refund in cash.
中文原文 電子支付機構業務管理規則第21條
電子支付機構辦理使用者支付款項退款作業時,應將相關款項依使用者原支付方式,退回至其原電子支付帳戶、原儲值卡、原存款帳戶或原信用卡帳戶。
電子支付機構經許可經營收受儲值款項業務,除使用者之原支付方式為信用卡刷卡外,得與使用者約定將前項退回款項轉為儲值款項,其儲值餘額仍應符合本條例第十六條第一項規定。
電子支付機構無法依前二項規定辦理退款作業時,應與使用者約定可供辦理退款作業之使用者本人存款帳戶,將相關款項轉入該存款帳戶,不得以現金支付。

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