STRIKE provides several payment methods, including credit card and paypal.
So far, the credit card payment is processed by HiTRUST, which would checkout in TWD.
( Note: 1 TWD ≈ 0.033 USD )
If you still want to pay with USD or any other currency, we may suggest you to click the Pay with PayPal button to checkout. When entering the Paypal interface, scroll to the bottom, there's a "Pay with Debit or Credit card" button.
Click it, and you can pay with any type of currency you preferred, Paypal account is NOT required.