Add security badge to your theme in Shopify

<a
  href="https://www.shopify.com/security/pci-compliant?utm_medium=shop&utm_source=secure"
  title="This online store is secured by Shopify"
  target="_blank"
  rel="nofollow"
>
  <img
    src="https://cdn.shopify.com/s/images/badges/shopify-secure-badge-white.svg"
    alt="Shopify secure badge"
  >
</a>