Custom mobile app and implement Push notify

Hi,
We have custom mobile app from traccar-manager-app iOS & Android and need to implement Push notify also
we have create Firebase project and download google-services.json into Android project and GoogleService-Info.plist into Xcode project

for Android to add plugins and dependencies in build.gradle file

for Xcode after put GoogleService-Info.plist and then to enable this script on AppDelegate.swift right?

Is this all we need to do? can we start build the project right away?

Android first, already put google-services.json and selected build variant is googleDebug

it build failed

Compilation error:

> Task :app:compileGoogleDebugKotlin FAILED
e: file:///C:/Users/user/.gradle/caches/transforms-3/06a85c92cb14c9b90e73303ac62102ec/transformed/play-services-measurement-api-22.2.0-api.jar!/META-INF/java.com.google.android.gmscore.integ.client.measurement_api_measurement_api.kotlin_moduleModule was compiled with an incompatible version of Kotlin. The binary version of its metadata is 2.1.0, expected version is 1.9.0.
e: file:///C:/Users/user/.gradle/caches/transforms-3/764584a5dcaa928172e95dfbe0ffdd27/transformed/play-services-measurement-impl-22.2.0-api.jar!/META-INF/java.com.google.android.gms.libs.filecompliance.proto_file_access_api_type_kt_proto_lite.kotlin_moduleModule was compiled with an incompatible version of Kotlin. The binary version of its metadata is 2.1.0, expected version is 1.9.0.
e: file:///C:/Users/user/.gradle/caches/transforms-3/764584a5dcaa928172e95dfbe0ffdd27/transformed/play-services-measurement-impl-22.2.0-api.jar!/META-INF/third_party.kotlin.protobuf.src.commonMain.kotlin.com.google.protobuf.kotlin_only_for_use_in_proto_generated_code_its_generator_and_tests.kotlin_moduleModule was compiled with an incompatible version of Kotlin. The binary version of its metadata is 2.1.0, expected version is 1.9.0.
e: file:///C:/Users/user/.gradle/caches/transforms-3/764584a5dcaa928172e95dfbe0ffdd27/transformed/play-services-measurement-impl-22.2.0-api.jar!/META-INF/third_party.kotlin.protobuf.src.commonMain.kotlin.com.google.protobuf.kotlin_shared_runtime.kotlin_moduleModule was compiled with an incompatible version of Kotlin. The binary version of its metadata is 2.1.0, expected version is 1.9.0.

not sure, it wrong any dependencies version in build.gradle or am I doing something wrong?

Please help advice. Thank you.

investigation and finding information and gpt help.
now Build passed and run with notify to work.

from build error: kotlin incompatible version: (The binary version of its metadata is 2.1.0, expected version is 1.9.0.)
fixed to change kotlin version in build.gradle file of project from 1.9.0 to version 2.1.0

select build variant googleDebug

Rebuild Project again and try to run app on Emulator

Test send Notify from web app

Next Xcode for iOS. I will try to do and share again.
thanks.