We require a print job to be paid with a credit or debit card before printing begins. This can be done one of two ways:Select the print job(s) that you wish to pay for and manually enter your payment method.Set-up Automatic Payments, allowing Lulu to automatically charge your credit card for all print jobs submitted through the API.Credit cards accepted in all countries:VISAMasterCardAmerican ExpressDiscoverDiner's Club When using the API sandbox environment, the following card information will work for testing orders:Card number: 4111 1111 1111 1111 Expiration: 03/30 CVC: 737