Why did I get Error Code 10486 by Paypal Payment?

When a buyer's funding source fails, the DoExpressCheckoutPayment call returns a 10486 error. If this error occurs, the buyer can return to PayPal where the buyer can add or choose an alternate funding source.

A funding source might fail for these reasons:

1. ◇  The billing address associated with the financial instrument could not be confirmed.
2. ◇  The transaction exceeds the card limit.
3. ◇  The transaction was denied by the card issuer.