Hi @Lostsouls2015,
It is up to the seller whether or not they will accept PayPal so you'll want to ask the seller first. However, if they do accept Payal, all of your available payment methods will be on display during checkout so that you can select which one you'd like to use. Not all purchases are eligible to be paid with PayPal Credit, so the best recommendation is to attempt your purchase and see if PayPal Credit shows up as an option. If it doesn't show up, then you may have to try a different transaction.
-Derrick
