Shopify meets all 6 categories of PCI Standards, and this complance extends to all online stores powered by Shopify.  You can read all the details of this compliance here:  https://www.shopify.ca/pci-compliantShopify processes your credit card information; I never see any of that information regarding your credit cards.  Alternately, you can choose Paypal for checkout.  Feel secure that all of your credit card information is kept private.Regarding you personal contact information and email address:  I never share that with anyone; your email address is shared with my email processors only.  You can unsubscribe any time by sending me an email telling me you would like to unsubscribe, and I will remove your name and email address from the list.