Do you know how to add it to the cart page?
I don't, but read some posts that say that you don't need it in the cart page. Am not exactly sure why. One reason seems to be that Shopify has some hidden spam defenses that store owners do not have access to.
We put the Google script into the customer and contact forms - there is a post that describes in detail what to do. If you know how to add it to do the cart, I'd be interested. Also, how to add it to the blog comments page is something we're looking into. Shopify seems to discourage this because they have some sort of spam protection, etc. They encourage adding additional questions - the honey trap. But, we couldn't figure out how exactly that would create additional fields on the comment form. So, it seems we're going in circles at the moment!
Not for our store!
Shopify added a button to add it automatically. Online Store ->
Preferences-> all the way to the bottom you will see it.
I think you may disable email messages from your profile - top right. That way you won't get any email notifications.
(Still figuring out how to navigate and use this forum and how it works ... it is neither simple nor straightforward, is it!)
I was able to use Firebase functions as the backend (for server-side integration). Pls see details in my blog here
Github repo (example): https://github.com/asmitab/recaptcha-v3-example
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