Preview and upgrade your customized checkout
If you're on the Shopify Plus plan and use a customized checkout, then an upgrade is available.
Upgrade your checkout to access new features, security updates, and accessibility improvements. You can preview the changes to make sure your customized checkout template works with the upgrade.
You have from January 20 to February 20, 2020 to preview, upgrade, and make necessary changes to your checkout. After this date, you will be automatically upgraded to the new checkout version.
To learn more about the upgrade and for a full list of changes, read the guide in the Shopify Help Center.