If unsure where to find that, simply go to your Shopify Admin and click "Domains" and it will be the top spot!
Copy and Paste that URL here:
After you submit this form we will be able to go in and request access to a very limited amount of your Shopify Data. We will be looking at "read only" on your product data meaning, we cannot change or modify anything and our view is limited only to your product section! It's important to be clear about what permission you are giving on Shopify to make sure your account is secure. We take security extremely seriously around here!