Facebook Audience: Move your Android apps to bidding before September 30

Note: i have read other similar threads but No solution
Hello Coders, good day to everyone and thank you for taking your time to help address my post,
I am using Facebook Audience in my App and I keep getting that notification in my audience network dashboard as showed in the image below, please anyone kindly help to assist in how to migrate to this bidding instruction. Honestly I don’t know whether if I just update my app can solve this problem but any suggestions and solutions can really help.

Secondly is there any Extension developer that can help create a mediation Plugin? that would be nice
Thank you once again for your time