Test credit card numbers
When a payment gateway module is in Test Mode, only orders using the test credit card numbers will be accepted by the processors. Real credit card numbers may only be used with the gateway is in 'live' mode. These numbers may also be used at any time with the offline "Credit Card Payment with Simple Validation" payment module to place test orders in your store.
Visa: 4111 1111 1111 1111
Use any expiration date in the future.