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Do you mean credit card or the PayPal Mastercard Business Debit Card? If you mean the mastercard business debit card, this happens to me quite regularly, but only when I use it online.
PayPal deny all knowledge of it, and say there is no declines showing on my account.
The way I fix it is go to the corner shop and use it to pay for a small item using chip and pin, which works fine, then go home and use it online, and it completes the purchase with no probems.