Cards can be declined for any number of reasons!
You'll receive an email notifying you when this happens, with a link to update your payment method:
You can also update it directly by following the steps below:
1) From the recurring donation page of the guest center click Edit next to the donation that failed.
2) Scroll to the Update payment method section. Click Add new to add a payment method on file or choose a different payment method already on file from the dropdown.
3. If you clicked Add new, fill out the information on the new card and click Submit.
4. Make sure you see the correct payment method listed and click Save. Your donation will be charged using the new payment method on its next scheduled date.