Thanks for your reply, Jon. The Amex in question is my 'preferred method of payment' card on my Paypal account so I find it odd that it might not have passed a security check but that's life in a digital world - sometimes things come up in data that flag a concern. In the end, I checked out via the vendor's website using their Afterpay option and used my Amex. If the issue crops up again with Paypal I'll come back here to raise it. Cheers, Bron.
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