If you use your credit card to make the order, sometimes your payment may be denied at the checkout by the system in defense against possible credit card fraud. Under such a situation, here are 4 solutions for you:1. If you have a PayPal account, please try to pay by PayPal. That is the best and effective way to solve this issue.2. Switch to your other credit/debit cards and try it again.3. If you do not have a PayPal account, you can also select PayPal at the checkout page & click the complete order button. Then you'll be directed to a page with access to both PayPal and Debit/Credit card payment (for the latter option, you don't have to register for PayPal).4. Call your credit card company or bank and let them know about the purchase so that they will not deny your purchase again.If the problem still exists, we recommend you contact us at firstname.lastname@example.org for guidance.