Here's how to turn on this feature:
1
Go to the "Settings" page in the EG app.
2
Find the section labeled "Checkout validations."
3
Check the box next to "Block customers from checking out with zero value carts."
4
Click the "Save" button.

Once you've done this, customers won't be able to complete checkout if their cart only contains items with a $0 value. Customers trying to checkout with only the free gift will see this screen and be unable to pay and checkout:

Important : This feature only works with Shopify's standard checkout. If you use a third-party checkout, this setting won't have any effect.
