There is no way to pay without creating the Paypal account. This is the final payment dialogue:
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By clicking Agree and Pay, I confirm that I want to use the card I entered above for my current and future purchases with T6 Forum. I authorise T6 Forum to charge my PayPal account for such purchases and I instruct PayPal to pay such amounts. I understand this lets me check out faster by not having to log in to PayPal to complete my purchase. I understand that if I have a PayPal balance, that balance will be used first and that if my preferred funding source has expired or has been declined, PayPal will charge my backup funding source. I can change my preferred funding source or cancel this authorisation at any time in my PayPal account. The payments will be treated by PayPal as pre-approved payments as specified in the PayPal User Agreement.
Agree and Pay
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I think that by the number of times that Paypal is mentioned it is safe to assume that you are paying via Paypal.
I have just attempted to pay by card without filling in the Paypal account boxes and it just throws up errors highlighted in red that the Paypal account creation isn't completed.
There is no way around Paypal at all.