consentics
Consentics doesn't have a Shopify app yet, so there's no supported way to install Consentics on a Shopify store today.
Don't paste your Consentics snippet into theme.liquid or any other Shopify template. Shopify applies consent decisions to its own surfaces (its pixels, audiences and checkout) through its Customer Privacy API, and the Consentics snippet doesn't report consent through that API. A pasted snippet would record consent for Consentics alone, so what your Consentics banner records and what Shopify's own pixels and checkout do could disagree.
If Shopify support matters to you, contact us and tell us about your store. It helps us understand demand.