I got it working by manually downloading and adding the following libraries as OP suggested, from the maven website they linked, and put them in Assets/Plugins/Android:
implementation project('FirebaseApp.androidlib')
implementation(name: 'common', ext:'aar')
implementation(name: 'play-services-games-v2-20.1.2', ext:'aar')
implementation(name: 'play-services-tasks-18.2.0', ext:'aar')
implementation(name: 'play-services-basement-18.4.0', ext:'aar')
implementation(name: 'play-services-base-18.5.0', ext:'aar')
This is my final mainTemplate.gradle dependencies:
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation project('FirebaseApp.androidlib')
implementation(name: 'common', ext:'aar')
implementation(name: 'play-services-games-v2-20.1.2', ext:'aar')
implementation(name: 'play-services-tasks-18.2.0', ext:'aar')
implementation(name: 'play-services-basement-18.4.0', ext:'aar')
implementation(name: 'play-services-base-18.5.0', ext:'aar')
// Android Resolver Dependencies Start
implementation 'com.google.android.gms:play-services-ads-identifier:18.0.1' // Assets/LevelPlay/Editor/IronSourceSDKDependencies.xml:17
implementation 'com.google.android.gms:play-services-base:18.5.0' // Assets/Firebase/Editor/DatabaseDependencies.xml:17
implementation 'com.google.android.gms:play-services-basement:18.4.0' // Assets/LevelPlay/Editor/IronSourceSDKDependencies.xml:25
implementation 'com.google.android.play:core-common:2.0.4' // Assets/GooglePlayPlugins/com.google.play.core/Editor/Dependencies.xml:3
implementation 'com.google.firebase:firebase-analytics:22.0.2' // Assets/Firebase/Editor/StorageDependencies.xml:15
implementation 'com.google.firebase:firebase-analytics-unity:12.2.0' // Assets/Firebase/Editor/AnalyticsDependencies.xml:18
implementation 'com.google.firebase:firebase-app-unity:12.2.0' // Assets/Firebase/Editor/AppDependencies.xml:22
implementation 'com.google.firebase:firebase-auth:23.0.0' // Assets/Firebase/Editor/AuthDependencies.xml:13
implementation 'com.google.firebase:firebase-auth-unity:12.2.0' // Assets/Firebase/Editor/AuthDependencies.xml:20
implementation 'com.google.firebase:firebase-common:21.0.0' // Assets/Firebase/Editor/AppDependencies.xml:13
implementation 'com.google.firebase:firebase-database:21.0.0' // Assets/Firebase/Editor/DatabaseDependencies.xml:13
implementation 'com.google.firebase:firebase-database-unity:12.2.0' // Assets/Firebase/Editor/DatabaseDependencies.xml:22
implementation 'com.google.firebase:firebase-firestore:25.0.0' // Assets/Firebase/Editor/FirestoreDependencies.xml:13
implementation 'com.google.firebase:firebase-firestore-unity:12.2.0' // Assets/Firebase/Editor/FirestoreDependencies.xml:20
implementation 'com.google.firebase:firebase-storage:21.0.0' // Assets/Firebase/Editor/StorageDependencies.xml:13
implementation 'com.google.firebase:firebase-storage-unity:12.2.0' // Assets/Firebase/Editor/StorageDependencies.xml:20
implementation 'com.ironsource.adapters:unityadsadapter:4.3.42' // Assets/LevelPlay/Editor/ISUnityAdsAdapterDependencies.xml:8
implementation 'com.ironsource.sdk:mediationsdk:8.2.1' // Assets/LevelPlay/Editor/IronSourceSDKDependencies.xml:9
implementation 'com.ironsource:adqualitysdk:7.20.3' // Assets/LevelPlay/Editor/IronSourceAdQualityDependencies.xml:9
implementation 'com.unity3d.ads:unity-ads:4.12.2' // Assets/LevelPlay/Editor/ISUnityAdsAdapterDependencies.xml:15
// Android Resolver Dependencies End
**DEPS**}