Please note: Experience has been that if there are problems with this process, the most likely cause is not following step 3 carefully. An actual PayPal account is NOT required (but you can use one if you have one).
Here are the steps, start to finish
Enter your name, email and invoice total, then click “Continue to PayPal to Finish Payment.”
You will now be redirected to PayPal. Login to the PayPal account you’d like to pay from OR select Pay with Debit or Credit Card.
If you logged into your PayPal account, select a payment method. If you selected Pay with Debit or Credit Card enter your CC details.
You’re done! If you are checking out as a guest, PayPal may ask you to enroll in their services. You can ignore, your payment will still be received.