1. online banking: log in to online banking or mobile banking, and check the interest and expenses of credit cards by querying account information or credit card bills.
2. Customer service hotline: Call the customer service hotline of the credit card issuing bank, ask the customer service staff for advice and provide credit card-related information, such as card number, cardholder's name, etc., and the customer service staff will inform them of the required interest and fee information.
3. Business outlets: Go to the counter or branch of the credit card issuing bank and explain to the counter staff the demand for inquiring about the interest fee. The staff will assist in inquiring about the interest fee of the credit card.