How would you add a warning message to your store checkout? A large number of my customers at this point are in an area where the shipping addresses can be considered invalid by any of the carriers that I use. I am wondering how I could add a warning message on the page where the customer enters their shipping information so they can avoid the possibility of the product being returned to sender.
This is only possible if you have Shopify plus or "Additional Analytics Script" enabled in preferences and this can be only enabled if your store is created before Jan 2019 by contacting with Support
I would highly recommend you to try the app Product Warnings on Checkout . You can show a warning on checkout if you have Shopify plus plan. This app also allows you to target warnings to certain countries or states.