Why does PayPal keep rejecting my credit/debit card?

If your credit/debit card is being rejected by PayPal with the message "The card you entered cannot be used for this payment. Please enter a different credit or debit card number." it might be due to one of the following reasons:

1. Your card is associated with a specific PayPal account, and you're not logging in with that particular account.
   
   
2. Your card associated with a PayPal account has been closed.
   
   
3. You've linked the card to a PayPal account, but have not yet confirmed it.
   
   
4. You've exceeded your card limit with the PayPal system.
   
   
5. Your email address is raising a red flag in PayPal's system.
   
   
6. Your browser is not accepting cookies.
   
   
7. You should clear any existing cookies and try again.