At the moment, we're using Paypal at payment gateway. However, you also can use your credit or debit card without having a Paypal account. Please follow these steps
Step 1: At check out, don't choose Paypal, just type in your email and shipping address then press "continue to shipping method"
Step 2 : Choose shipping method (USPS) and click "Continue to payment method"
Step 3: Key in Billing address (if it's not the same with shipping address) and click "Complete order"
Step 4: A Paypal pop-up window will appear, you can choose "Pay with credit or debit card"