diff --git a/.gitignore b/.gitignore
index 969eee4..a8b9dd3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,5 +2,6 @@
 .idea
 .DS_Store
 local.properties
+google-services.json
 *.iml
 build
diff --git a/app/build.gradle b/app/build.gradle
index 21d8e63..73bfea8 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -9,13 +9,21 @@ android {
 
     defaultConfig {
         applicationId 'com.tananaev.passportreader'
-        minSdkVersion 15
+        minSdkVersion 19
         targetSdkVersion 33
-        versionCode 18
-        versionName "2.3"
+        versionCode 19
+        versionName '3.0'
         multiDexEnabled = true
     }
-    namespace "com.tananaev.passportreader"
+    namespace 'com.tananaev.passportreader'
+
+    flavorDimensions 'default'
+    productFlavors {
+        regular {
+            isDefault = true
+        }
+        google
+    }
 
     packagingOptions {
         resources {
@@ -35,6 +43,27 @@ dependencies {
     implementation 'com.madgag.spongycastle:prov:1.54.0.0'
     implementation 'com.gemalto.jp2:jp2-android:1.0.3'
     implementation 'com.github.mhshams:jnbis:1.1.0'
-    implementation 'org.bouncycastle:bcpkix-jdk15on:1.65'
+    implementation 'org.bouncycastle:bcpkix-jdk15on:1.65' // do not update
     implementation 'commons-io:commons-io:2.8.0'
+    googleImplementation platform('com.google.firebase:firebase-bom:31.0.0')
+    googleImplementation 'com.google.firebase:firebase-analytics-ktx'
+    googleImplementation 'com.google.firebase:firebase-crashlytics'
+    googleImplementation 'com.google.android.gms:play-services-ads:21.3.0'
+    googleImplementation 'com.google.android.play:review-ktx:2.0.1'
+}
+
+if (getGradle().getStartParameter().getTaskRequests().toString().contains('Google')) {
+    apply plugin: 'com.google.gms.google-services'
+    apply plugin: 'com.google.firebase.crashlytics'
+
+    task copyJson(type: Copy) {
+        from '../../environment/firebase'
+        into '.'
+        include 'passport-reader.json'
+        rename('passport-reader.json', 'google-services.json')
+    }
+
+    afterEvaluate {
+        preBuild.dependsOn copyJson
+    }
 }
diff --git a/app/src/google/AndroidManifest.xml b/app/src/google/AndroidManifest.xml
new file mode 100644
index 0000000..0968fb1
--- /dev/null
+++ b/app/src/google/AndroidManifest.xml
@@ -0,0 +1,24 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <application>
+
+        <activity
+            android:name=".GoogleActivity"
+            android:screenOrientation="fullSensor"
+            android:exported="true">
+
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+
+            <intent-filter>
+                <action android:name="com.tananaev.passportreader.REQUEST" />
+                <category android:name="android.intent.category.DEFAULT" />
+            </intent-filter>
+
+        </activity>
+
+    </application>
+
+</manifest>
diff --git a/app/src/google/java/com/tananaev/passportreader/GoogleActivity.kt b/app/src/google/java/com/tananaev/passportreader/GoogleActivity.kt
new file mode 100644
index 0000000..96e03fd
--- /dev/null
+++ b/app/src/google/java/com/tananaev/passportreader/GoogleActivity.kt
@@ -0,0 +1,60 @@
+package com.tananaev.passportreader
+
+import android.os.Bundle
+import android.preference.PreferenceManager
+import android.widget.FrameLayout
+import com.google.android.gms.ads.AdRequest
+import com.google.android.gms.ads.AdSize
+import com.google.android.gms.ads.AdView
+import com.google.android.gms.ads.MobileAds
+import com.google.android.play.core.review.ReviewManagerFactory
+import com.google.firebase.analytics.FirebaseAnalytics
+import com.google.firebase.analytics.ktx.analytics
+import com.google.firebase.ktx.Firebase
+
+class GoogleActivity : MainActivity() {
+    private lateinit var firebaseAnalytics: FirebaseAnalytics
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        firebaseAnalytics = Firebase.analytics
+        MobileAds.initialize(this) {}
+
+        val adView = AdView(this).apply {
+            setAdSize(AdSize.BANNER)
+            adUnitId = "ca-app-pub-9061647223840223/5869276959"
+            loadAd(AdRequest.Builder().build())
+        }
+        val params = FrameLayout.LayoutParams(
+            FrameLayout.LayoutParams.MATCH_PARENT,
+            FrameLayout.LayoutParams.WRAP_CONTENT,
+        )
+        val containerView: FrameLayout = findViewById(R.id.bottom_container)
+        containerView.addView(adView, params)
+    }
+
+    override fun onResume() {
+        super.onResume()
+        handleRating()
+    }
+
+    @Suppress("DEPRECATION")
+    private fun handleRating() {
+        val preferences = PreferenceManager.getDefaultSharedPreferences(this)
+        if (!preferences.getBoolean("ratingShown", false)) {
+            val openTimes = preferences.getInt("openTimes", 0) + 1
+            preferences.edit().putInt("openTimes", openTimes).apply()
+            if (openTimes >= 5) {
+                val reviewManager = ReviewManagerFactory.create(this)
+                reviewManager.requestReviewFlow().addOnCompleteListener { infoTask ->
+                    if (infoTask.isSuccessful) {
+                        val flow = reviewManager.launchReviewFlow(this, infoTask.result)
+                        flow.addOnCompleteListener {
+                            preferences.edit().putBoolean("ratingShown", true).apply()
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 8e56418..e8a62af 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -12,35 +12,14 @@
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
 
-        <activity
-            android:exported="true"
-            android:name=".MainActivity"
-            android:screenOrientation="fullSensor">
-
-            <intent-filter>
-                <action android:name="android.intent.action.MAIN" />
-                <category android:name="android.intent.category.LAUNCHER" />
-            </intent-filter>
-
-            <intent-filter>
-                <action android:name="com.tananaev.passportreader.REQUEST" />
-                <category android:name="android.intent.category.DEFAULT" />
-            </intent-filter>
-
-            <!--<intent-filter>
-                <action android:name="android.nfc.action.TECH_DISCOVERED" />
-            </intent-filter>
-
-            <meta-data
-                android:name="android.nfc.action.TECH_DISCOVERED"
-                android:resource="@xml/nfc_tech_filter" />-->
-
-        </activity>
+        <meta-data
+            android:name="com.google.android.gms.ads.APPLICATION_ID"
+            android:value="ca-app-pub-9061647223840223~3001602354"/>
 
         <activity
             android:exported="true"
             android:name=".ResultActivity"
-            android:screenOrientation="portrait" />
+            android:screenOrientation="fullSensor" />
 
     </application>
 
diff --git a/app/src/main/java/com/tananaev/passportreader/MainActivity.kt b/app/src/main/java/com/tananaev/passportreader/MainActivity.kt
index 0bc6c00..c9f2e66 100644
--- a/app/src/main/java/com/tananaev/passportreader/MainActivity.kt
+++ b/app/src/main/java/com/tananaev/passportreader/MainActivity.kt
@@ -73,7 +73,7 @@ import java.text.ParseException
 import java.text.SimpleDateFormat
 import java.util.*
 
-class MainActivity : AppCompatActivity() {
+abstract class MainActivity : AppCompatActivity() {
 
     private lateinit var passportNumberView: EditText
     private lateinit var expirationDateView: EditText
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index b94a222..8a0bbcb 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -98,4 +98,10 @@
 
     </ScrollView>
 
+    <FrameLayout
+        android:id="@+id/bottom_container"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_gravity="bottom" />
+
 </FrameLayout>
diff --git a/app/src/regular/AndroidManifest.xml b/app/src/regular/AndroidManifest.xml
new file mode 100644
index 0000000..d855f74
--- /dev/null
+++ b/app/src/regular/AndroidManifest.xml
@@ -0,0 +1,24 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <application>
+
+        <activity
+            android:name=".RegularActivity"
+            android:screenOrientation="fullSensor"
+            android:exported="true">
+
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+
+            <intent-filter>
+                <action android:name="com.tananaev.passportreader.REQUEST" />
+                <category android:name="android.intent.category.DEFAULT" />
+            </intent-filter>
+
+        </activity>
+
+    </application>
+
+</manifest>
diff --git a/app/src/regular/java/com/tananaev/passportreader/RegularActivity.kt b/app/src/regular/java/com/tananaev/passportreader/RegularActivity.kt
new file mode 100644
index 0000000..e3d3b88
--- /dev/null
+++ b/app/src/regular/java/com/tananaev/passportreader/RegularActivity.kt
@@ -0,0 +1,3 @@
+package com.tananaev.passportreader
+
+class RegularActivity : MainActivity()
diff --git a/build.gradle b/build.gradle
index f646a3a..1ef989c 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,8 +5,10 @@ buildscript {
         mavenCentral()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:7.3.1'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+        classpath 'com.android.tools.build:gradle:7.3.1'
+        classpath 'com.google.gms:google-services:4.3.14'
+        classpath 'com.google.firebase:firebase-crashlytics-gradle:2.9.2'
     }
 }
 
diff --git a/gradle.properties b/gradle.properties
index 5465fec..5a40459 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,2 +1,3 @@
+org.gradle.jvmargs=-Xmx4096m
 android.enableJetifier=true
 android.useAndroidX=true
\ No newline at end of file