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When testing the card checkout features on sandbox its advisable to use test card numbers The sandbox pretty much accepts anything that passes the Luhn Algorithm test (See here).
You can generate card numbers using external sites like these:
http://www.fakenamegenerator.com/
http://www.getcreditcardnumbers.com/
http://saijogeorge.com/dummy-credit-card-generator/
Or you can generate them within PayPal using this guide below: