Does Shopify offer CMS integration?

Yes, Shopify does offer CMS integration, as well as a built-in CMS to the Shopify platform. Although Shopify does offer its own CMS, it's very limited with customization, has a lack of integration with plugins, and will slow down as you add content, so it's best to seek a dedicated headless CMS.

If you're looking for the most bang for your buck, then make sure you're using Shopify Plus, which scales better and provides additional resources.