You credit card may be rejected at checkout if the payment system detects suspicious signals. Please call your credit card company to verify the purchase.

Under such circumstance, here are 2 solutions for you:
If you have a PayPal account, please try to pay by PayPal.

If you do not have a PayPal account,please pay by your credit/debit cards after completing some required info below.
As following steps:
Step 1. Fill in your basic info
Step 2. Choose the right shipping method
Step 3. Fill in your credit/debit card info