The solution to your credit card being detained by customs is to provide the necessary documents or information and contact the credit card company.

1. Provide necessary documents or information: If the customs requires further documents or information, it needs to be provided as soon as possible. This includes payment vouchers, purchase vouchers, order confirmations and invoices, etc.

2. Contact the credit card company: If you find that your credit card has been withheld due to problems with the credit card company, such as insufficient credit limit, you need to contact the credit card company directly to ask them the reason and find a solution.