When publishing an integrated developer portal, I don’t see any option to select environments. Is there a way to configure testing environments, such as staging or development, to enable the testing team to
test the developer portal before publishing it to production?
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Unfortunately there is no way to do this now with a single portal. One alternate option is to have multiple portals and stage your changes in one, test them, and then apply the same changes to the production portal, once you are satisfied with your testing.
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How to migrate changes to production ?
One thing to add to that - menus, pages and theme all have draft versions that can be previewed before publishing them to the portal.
This would have to be done via API. APIs for Catalog Items are public, additionally there’s this github project (for Hybrid/X) that some may find a useful tool for interacting with the APIs.