Is SSL offered with Commerce?
Yes. Checkout and payment pages are served over SSL in your Commerce site
What are Stripe’s merchant processing fees?
Stripe Pricing | Stripe Fees
2.9% + 30 cents per successful transaction
2.4% + 20 pence per successful transaction
2.4% + 24 cents per successful transaction + Value Added Tax (VAT)
1.75% + 30 cents for domestic cards and 2.9% + 30 cents for American Express or international cards