The test cards don't include a card verification code (CVV), you can use 123 as the CVV for Visa, MasterCard, Discover and Diners Club or 1234 as the CVV for American Express.
When using test cards, you can specify an expiration date in the future, using one of the following formats:
PayPal Payments Pro – Use format mmyyyy.
PayPal Payflow Pro – Use format mmyy.
You can also generate card numbers using an external site like:
<removed> - <don't share external links>
You may also use test credit card numbers that are issued within the PayPal Sandbox account.
Hope this helps.
... View more