Do you have to register your Debit or Credit card with your PayPal account or can you enter those card details when you come to pay?

You can either register your debit or credit card with your PayPal account or enter the card details at the time of payment. If you register the card, it will be saved for future transactions, making the checkout process quicker. However, entering the card details each time is also an option if you prefer not to save them.