Use credit card number 4000000000000002 to generate a generic card declined message.
Use credit card number 4000000000009995 to generate an insufficient funds decline message.
Use credit card number 4000000000009987 to generate a lost card decline message.
Use credit card number 4000000000009979 to generate a stolen card decline message.
Use credit card number 4000000000000069 to generate an expired card message.
Use credit card number 4000000000000127 to generate an incorrect CVC message.
Use credit card number 4000000000000119 to generate a processing error message.
Use credit card number 4242424242424241 to generate an incorrect number message.
Use credit card number 4000000000000259 to simulate a disputed transaction.
Use an invalid expiry month, such as 13, to generate an invalid expiry month message.
Use an expiry year in the past to generate an invalid expiry year message.
Use a two-digit security code number to generate an invalid security code message.