You can pay by Visa, Master Card or via the payment systems Apple Pay. To pay for your purchase, you will be redirected to the Stripe payment system server, where you must enter the necessary data. When paying by bank card, payment security is guaranteed by the Stripe processing center.
No one, including "SmartBoost", can get your bank card details or other data required to make a payment.
You can change it later in the top nav menu. Please note, that price of services might be different for different regions.
Also the currency matches certain region.