All stores powered by Shopify are PCI compliant by default so you can keep payment info and business data safe.
Feel protected with every transaction
Shopify’s compliance covers all six PCI standard categories and applies to every store using our platform.
Maintain a secure network
Protect cardholder data
Maintain a vulnerability management program
Implement strong access control measures
Regularly monitor and test networks
Maintain an information security policy
source: https://www.shopify.co.uk/security/pci-compliant