There's another thread here where people - seemingly just in the Netherlands and Belgium – are experiencing the same problem. https://www.paypal-community.com/t5/About-Payments/Paypal-is-suddenly-asking-to-add-a-creditcard-on-checkout/m-p/1008475#U1008475
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Had this problem for a few days and am also in the Netherlands. Just tried again to make a payment following on from the post above saying the situation had been resolved for someone. No luck, I'm afraid. It's still not functioning properly.
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