Credit card refund details can be queried through the following methods (refund details are the amounts expressed as negative numbers): 1. For online banking inquiries, log in to the online banking public version/professional version, click "Account Management"-" Inquiry on issued bills” or “Inquiry on unissued bills”. 2. Self-service voice inquiry: Call the credit card customer service hotline, after verifying your identity, press 1, then 5 to enter "Bills and Transaction Details of the Past Year". Or press 1 and then 3 to enter "Unissued Bills".