LawPay can be used for both attorney fee and USPTO fee payments. It acts like a standard credit card payment page. It accepts Visa, Mastercard, and American Express. Enter in your name, address, email and phone. If you want a USPTO patent fee to be paid for you, separate this USPTO patent fee from the other attorney fees, and submit the USPTO patent fee, by itself, through the LawPay USPTO account link below.
The PayPal system is only for attorney fee payments. It works like a standard online shopping cart. Enter in the amount you wish to purchase in units of $1.00. The system will also ask you for your address for "shipping and handling", but there is no actual shipping fee. You can make payment either using your PayPal account, or by giving your credit card to PayPal and by following their instructions on the checkout page. To use a credit card, please select the "check out" box on the shopping cart page.