If there is a message in the 'Expiring Card Message' box, a pop up message will be shown when a member who has a credit card that will expire in 30 days logs into your site.
If this box is left blank, no message will be appear.
This applies to members of recurring plans only.
Edit the 'Expiring Card Message' box:
1. Under 'Master Settings' choose 'Edit Site Descriptions'
2. The message can be edited in the 'Credit Card About To Expire Message' box
For more information about this functionality, please review this video