No worries Chris, just getting back in touch on this. I was able to confirm that we will notify merchants if there are apps who haven’t migrated to the new Markets set-up (this will surface in multiple spots and eventually in the admin’s landing page, as usually happens), but in terms of what’s needed to be done to migrate over successfully, there is a bit more info in this thread if you haven’t checked it out yet. My understanding is that you’d just need to follow these three steps though:
- Review the developer documentation, API documentation and an overview of notable changes to help inform your testing and update efforts.
- Create a new development store and enable the developer preview from your Partner Dashboard to start testing the new Markets functionality.
- Update to the 2025-04 API version as soon as possible.
Setting up a new developer shop with the New Markets preview is one requirement - so I wanted to mention that as well. One thing that’s not mentioned in the thread there though is using unifiedMarkets to determine if a merchant is using “Legacy” or "New Markets - just wanted to include that since it might be helpful too.
Hope this helps - helt me know if I can clarify anything as always.