When applying for a credit card, the identity document required must be valid for at least 30 days.

The validity period of the ID card cannot be less than 30 days when applying for a credit card. This means that when applying for a credit card, the ID card required must be valid for at least 30 days. This requirement is to ensure that the identity document will not expire during the processing process, so as not to cause inconvenience or affect the processing results.