Use our Credit Card Generator to generate random credit card details for testing. You can create test versions of Visa, Mastercard, American Express, Discover, Maestro, or JCB credit cards. You can also find a list of credit card numbers in our developer documentation.
Test credit card numbers are used in the PayPal Sandbox to validate the authorization, capture, and credit transaction flows. Because test credit 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.
Note: If you are testing transactions on a Payflow integration, use the expiration date format mmyy.
See also:
How do I create a Sandbox account?
How do I Link, Remove, or Update a card?
PayPal Sandbox Testing Guide