Regulations Governing the Dedicated Deposit Account of Specialized Electronic Payment Institutions Article 9

A specialized electronic payment institution may, in view of business needs, choose cooperative banks, and open only one cooperative account for each currency at a cooperative bank.
中文原文 電子支付機構專用存款帳戶管理辦法第9條
專營電子支付機構得視業務需要選擇合作銀行,於單一合作銀行之各幣別合作帳戶以一戶為限。

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