We use PayPal, the online payment service, which accepts domestic Visa, MasterCard, Discover, and American Express cards, for secure online purchasing. Please note that when using the PayPal system for the first time, if you enter a new card, or enter incorrect billing address or verification details for your credit card, PayPal may require you to complete a registration process in order to validate your card. These mesures are intended to reduce card fraud. If you experience any problems during checkout, with the entry or acceptance of your credit card information, you can call PayPal Customer Service for assistance at 1-402-935-2050