All existing actions of Scan barcode should not be affected. It is no longer available for new users and new apps
If you need to create a new custom action with the Scan barcode action, we recommend duplicating an action that has the Scan barcode action block in the Action Editor
If you need to create a new app with the Scan barcode action, you can also duplicate an app with the Scan barcode action
Let me know if you have any questions!