Minified build crashes with java.lang.ClassCastException java.lang.Class cannot be cast to java.lang.reflect.ParameterizedType

[mateot1]

Fatal Exception: java.lang.ClassCastException: java.lang.Class cannot be cast to java.lang.reflect.ParameterizedType
       at com.affirm.android.AffirmClient$1.onResponse(AffirmClient.java:86)
       at com.google.firebase.perf.network.InstrumentOkHttpEnqueueCallback.onResponse(InstrumentOkHttpEnqueueCallback.java:71)
       at okhttp3.internal.connection.RealCall$AsyncCall.run(RealCall.kt:519)
       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1137)
       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:637)
       at java.lang.Thread.run(Thread.java:1012)

This seems similar to: square/retrofit#3751
I can't tell if you're using Retrofit, but considering your last release was in early 2022 I would guess you also need to make changes to support R8

[mateot1]

After looking more closely at AffirmClient I see you are not using Retrofit, but Okhttp directly.
For now, keeping everything via -keep class com.affirm.android.** { *; } , seems to fix the crash. not sure if there are more precise rules you'd suggest.