The Act Governing Electronic Payment Institutions Article 25

Specialized electronic payment institutions shall establish a user and contracted institution identity verification mechanism and retain the data obtained in the identification process. The user and contracted institution identification process shall adopt a risk-based approach and include a review of beneficial owners.The retention period for data obtained in the user and contracted institution identification process referred to in the preceding paragraph shall be at least five (5) years after the termination of the business relationship.Regulations governing the manner of establishment and process for user and contracted institution identification mechanism referred to in Paragraph 1 hereof, its management, the scope of data obtained in the user and contracted institution identification process prescribed in the preceding paragraph, and other related matters shall be prescribed by the competent authority in consultation with the Ministry of Justice and the Central Bank.
中文原文 電子支付機構管理條例第25條
專營電子支付機構應建立使用者及特約機構身分確認機制,並留存確認身分程序所得資料;其確認使用者及特約機構身分程序應以風險為基礎,並應包括實質受益人之審查。
前項確認使用者及特約機構身分程序所得資料之留存期間,自業務關係結束後至少五年。
第一項使用者及特約機構身分確認機制之建立方式、程序、管理及前項確認使用者及特約機構身分程序所得資料範圍等相關事項之辦法,由主管機關會商法務部及中央銀行定之。

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