With multiple Debit or Credit cards, you can set your proffered payment method in PayPal.
1. Log in to your PayPal account.
2. On top of the menu, click on Wallet.
3. Click on the card you wish to set up as the preferred payment method from the left side.
4. Find Set as preferred and click on it.
You have successfully set your preferred payment method. PayPal will now use it by default when you pay.