We use multiple payment gateways that accept different types of credit card payments depending on the currency you select (USD vs. CAD). Orders can fail if you attempted to complete an order with a non-supported type of credit card or if the credit card was declined. If you are using a credit card that is not VISA or MasterCard, use the PayPal payment method. A PayPal account is not required to make payments with a American Express, Discover, MasterCard, Visa etc. Orders can also fail if your billing address entered at checkout does not match your credit card billing address on file. For failed orders using PayPal payment, we recommend contacting PayPal directly to verify your PayPal account or credit card. If you continue to experience problems completing an order please contact us for more information