Dear Sir/Madam,
I'm experienced with the limitation on Google Play, please, let me help you.
SHare your sources and I update the functionality to support API level 26. Let's complete it in a hour or so.
I'm experiences in background work, notifications and possible issues with migration to the last versions of tools.
From you:
- sources
- test accounts, if applicable to your application
From me:
- working sources for API26
- I want to release a right to ask you about rewriting some parts of your application for extra amount, if they use very ancient technologies.