Authorize.net testing Credit Cards
https://www.rpmware.com/support/customers-&-orders/questions/test-credit-card-numbers
370000000000002 American Express Test Card
6011000000000012 Discover Test Card
5424000000000015 MasterCard Test Card
4007000000027 Visa Test Card
4012888818888 Visa Test Card
4222222222222 Visa Error Test