I had bad experience to use credit card.
I 'd like to use Paypal instead.
Does F-secure accept Paypal payment?
I tried to initiate a purchase and Paypal was one of options.
Maybe there can be limitations based on user's location (with more or less purchase options), but you could check it.
My try was via their onlineshop (from F-Secure website and F-Secure SAFE page).
Thank you so much for your answering my question.
It help me a lot, I'll consider F-secure safe will be a better candidate in other security soft, expenseve though.