You can add up to three credit or debit cards and one PayPal account to your account wallet and you can choose one of these payment methods as your preferred method so that it is automatically charged when you select [Confirm Purchase].
To select a defaul payment method on your PlayStation 4:
Even if you have PayPal saved as your default payment method, you will not be able to see your PayPal account details in the [Billing Information] section of PlayStation Store.
If you have PayPal saved as your default payment method, the [Billing Information] section of PlayStation Store will not contain any payment details because you cannot pay with PayPal on PlayStation Store. You can only pay using existing wallet credit or top up using a credit/debit card or voucher code.
If you add a card to make a purchase this card will become your default payment method, your PayPal details will be completely removed from your account and you will need to add them again.
Even if you have PayPal saved as your default payment method, you will not be able to see your PayPal account details in the [Billing Information] section of Account Management.
When PayPal is default payment method adding a credit or debit card will delete PayPal information from the account and make the new card default payment method. PayPal information will need to be added to the account again.