If you have a foreign currency debt on your Bank of China credit card supplementary card, you can repay it in the following ways:

1. When you have a foreign currency debt, you can go directly to the Bank of China counter to purchase foreign currency and repay it. payment.

2. After paying off the current RMB bill balance of the supplementary card and depositing an additional amount, you can call the Bank of China Credit Card Customer Service Center at 4006695566 to handle the telephone foreign exchange purchase business.

3. You can also handle automatic repayment for supplementary cards. However, the main card is for active repayment, and the supplementary card cannot apply for automatic repayment.

If you have any questions, you are welcome to consult the Bank of China online customer service or download and use the Bank of China mobile banking APP to consult and handle related services.

The above content is for your reference, please refer to actual business regulations.