Push Notifications: Proguard Minify workaround

Symptoms:

• When enabling Minify on your project push notifications causes errors warning missing dlls

Resolution:

You can force certain classes to be kept by Proguard

To enable a custom proguard in Unity editor go to:
EDIT > PROJECT SETTINGS > PLAYER > PUBLISH SETTINGS > BUILD > CUSTOM PROGUARD FILE

Open the file created under the path specified for your Custom Proguard file and append the following line

-keep class com.unity.services.pushnotifications** { *;}