This message indicates that your funding instrument (creditcard) bank has refused the transaction request. We can't see why it was declined, only your bank can confirm the specific reason.
The most common reasons for declines are:
- Incorrect credit card number or expiration date
- Insufficient funds
- The bank declined based on location
- The bank's fraud rules blocked the transaction
If you are running into this issue, try paying with a different method or retry the Paypal payment at a later time