You do not need a PayPal account to pay to use PayPal and make payment with a credit card.  You may enter your credit card directly into PayPal to make payment. You can do so without creating a Paypal account.  Here's what to do after you're redirected from a website to PayPal:

1. Select the "Don't have a PayPal account?" option.

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2. Enter your credit card information and click on "Review and Continue".

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3. Click on "Pay Now"

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4. Click on "No, Thanks"

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That's it, you're done.