Locate the Popup storefront created in a previous step and click on the No whitelisted websites ( RED BOX ) badge. If you have whitelisted a website before, look for a {number} whitelisted websites badge.
In the popup shown, write your checkout domains, both the testing and the production domains, into the field, including the https:// .
For example, if your production domain is shop.example.com and your testing domain is shop.test.example.com, write the following two lines into the field:
