diff --git a/app/build.gradle b/app/build.gradle
index af89d0c..eeda79f 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -36,6 +36,17 @@ android {
         }
     }
 
+    productFlavors {
+        fdroid {
+            buildConfigField "String", "PAYPAL_USER", "\"mashin87@gmail.com\""
+            buildConfigField "String", "PAYPAL_CURRENCY_CODE", "\"USD\""
+            buildConfigField "String", "BITCOIN_ADDRESS", "\"16coztryz7xbNNDNhhf98wuHmi3hEintsW\""
+        }
+        google {
+            buildConfigField "String", "GOOGLE_PLAY_PUBKEY", "\"MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA384jTCBEuJ8nCWaC4S6AFrnMQN4mBlmkOXHV3Xg5hlFOl8TkVwiCfqz8r20yJpEy0IJ1+3QRnlq59zadUxbkD+PacJlGB/r2b3mbKfu+m0K+e/0aL6eWupjMSIyPgpnbN3uswiBEGUb4ytzYF53ZKTbLARnruQdMnjV6+VyfwMgpor/48anVQawDARBj/AIAj6VGtRHLmg6DmKDyOGQ7uCgXSv+ysnBKJjtIX/L/5nQgL8Q+9jsr2knuWY7j9BmrtpUXaDH3Kb50M1TOCKiqxPGa8lInOOIndABWxcpqmSMXP06SPYOanUlEH7lT0jjqpHpFNx8hRTT9xf652rgMJwIDAQAB\""
+        }
+    }
+
     externalNativeBuild {
         cmake {
             path "CMakeLists.txt"
@@ -79,8 +90,8 @@ dependencies {
     compile 'com.android.support:design:25.1.0'
     compile 'com.google.firebase:firebase-core:10.0.1'
     compile 'com.google.firebase:firebase-crash:10.0.1'
-    compile 'com.anjlab.android.iab.v3:library:1.0.38'
     compile 'commons-io:commons-io:2.5'
+    compile 'org.sufficientlysecure:donations:2.5'
     compile 'org.sufficientlysecure:html-textview:3.0'
     compile 'org.commonjava.googlecode.markdown4j:markdown4j:2.2-cj-1.1'
     compile 'com.afollestad.material-dialogs:core:0.9.2.3'
diff --git a/app/src/fdroid/java/org/emunix/unipatcher/ui/activity/DonateActivity.java b/app/src/fdroid/java/org/emunix/unipatcher/ui/activity/DonateActivity.java
new file mode 100644
index 0000000..ba13bdb
--- /dev/null
+++ b/app/src/fdroid/java/org/emunix/unipatcher/ui/activity/DonateActivity.java
@@ -0,0 +1,69 @@
+/*
+ Copyright (c) 2017 Boris Timofeev
+
+ This file is part of UniPatcher.
+
+ UniPatcher is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ UniPatcher is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with UniPatcher.  If not, see <http://www.gnu.org/licenses/>.
+
+ */
+
+package org.emunix.unipatcher.ui.activity;
+
+import android.os.Bundle;
+import android.support.v4.app.FragmentTransaction;
+import android.support.v7.app.AppCompatActivity;
+import android.support.v7.widget.Toolbar;
+import android.view.MenuItem;
+
+import org.emunix.unipatcher.BuildConfig;
+import org.emunix.unipatcher.R;
+import org.sufficientlysecure.donations.DonationsFragment;
+
+public class DonateActivity extends AppCompatActivity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_donate);
+        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
+        setSupportActionBar(toolbar);
+        try {
+            getSupportActionBar().setDisplayHomeAsUpEnabled(true);
+        } catch (NullPointerException e) {
+            /* empty */
+        }
+        getSupportActionBar().setTitle(R.string.donate_activity_title);
+
+        FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
+        DonationsFragment donationsFragment = DonationsFragment.newInstance(BuildConfig.DEBUG,
+                false, null, null, null,
+                true, BuildConfig.PAYPAL_USER, BuildConfig.PAYPAL_CURRENCY_CODE, getString(R.string.donation),
+                false, null, null,
+                true, BuildConfig.BITCOIN_ADDRESS);
+
+        ft.replace(R.id.donate_fragment, donationsFragment, "fragment");
+        ft.commit();
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        switch (item.getItemId()) {
+            case android.R.id.home:
+                finish();
+                return true;
+            default:
+                return super.onOptionsItemSelected(item);
+        }
+    }
+}
diff --git a/app/src/google/AndroidManifest.xml b/app/src/google/AndroidManifest.xml
new file mode 100644
index 0000000..d7ff1a7
--- /dev/null
+++ b/app/src/google/AndroidManifest.xml
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="org.emunix.unipatcher">
+
+    <uses-permission android:name="com.android.vending.BILLING" />
+
+    <application />
+
+</manifest>
diff --git a/app/src/google/java/org/emunix/unipatcher/ui/activity/DonateActivity.java b/app/src/google/java/org/emunix/unipatcher/ui/activity/DonateActivity.java
new file mode 100644
index 0000000..59d1df6
--- /dev/null
+++ b/app/src/google/java/org/emunix/unipatcher/ui/activity/DonateActivity.java
@@ -0,0 +1,88 @@
+/*
+ Copyright (c) 2017 Boris Timofeev
+
+ This file is part of UniPatcher.
+
+ UniPatcher is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ UniPatcher is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with UniPatcher.  If not, see <http://www.gnu.org/licenses/>.
+
+ */
+
+package org.emunix.unipatcher.ui.activity;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.support.v4.app.Fragment;
+import android.support.v4.app.FragmentManager;
+import android.support.v4.app.FragmentTransaction;
+import android.support.v7.app.AppCompatActivity;
+import android.support.v7.widget.Toolbar;
+import android.view.MenuItem;
+
+import org.emunix.unipatcher.BuildConfig;
+import org.emunix.unipatcher.R;
+import org.sufficientlysecure.donations.DonationsFragment;
+
+public class DonateActivity extends AppCompatActivity {
+
+    private static final String[] GOOGLE_PLAY_CATALOG = new String[]{"donate_1", "donate_3",
+            "donate_5", "donate_10", "donate_25", "donate_50", "donate_100"};
+    private static final String[] GOOGLE_PLAY_COST = new String[]{"$1", "$3", "$5", "$10",
+            "$25", "$50", "$100"};
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_donate);
+        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
+        setSupportActionBar(toolbar);
+        try {
+            getSupportActionBar().setDisplayHomeAsUpEnabled(true);
+        } catch (NullPointerException e) {
+            /* empty */
+        }
+        getSupportActionBar().setTitle(R.string.donate_activity_title);
+
+        FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
+        DonationsFragment donationsFragment = DonationsFragment.newInstance(BuildConfig.DEBUG,
+                true, BuildConfig.GOOGLE_PLAY_PUBKEY, GOOGLE_PLAY_CATALOG, GOOGLE_PLAY_COST,
+                false, null, null, null,
+                false, null, null,
+                false, null);
+
+        ft.replace(R.id.donate_fragment, donationsFragment, "donationsFragment");
+        ft.commit();
+    }
+
+    @Override
+    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
+        super.onActivityResult(requestCode, resultCode, data);
+
+        FragmentManager fragmentManager = getSupportFragmentManager();
+        Fragment fragment = fragmentManager.findFragmentByTag("donationsFragment");
+        if (fragment != null) {
+            fragment.onActivityResult(requestCode, resultCode, data);
+        }
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        switch (item.getItemId()) {
+            case android.R.id.home:
+                finish();
+                return true;
+            default:
+                return super.onOptionsItemSelected(item);
+        }
+    }
+}
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 3b6c3f0..5b31313 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -6,7 +6,6 @@
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.WAKE_LOCK" />
-    <uses-permission android:name="com.android.vending.BILLING" />
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
 
@@ -67,9 +66,8 @@
             android:value="@integer/google_play_services_version" />
 
         <activity
-            android:name="com.google.android.gms.ads.AdActivity"
-            android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"
-            android:theme="@android:style/Theme.Translucent" />
+            android:name=".ui.activity.DonateActivity"
+            android:label="@string/donate_activity_title" />
 
         <service
             android:name=".WorkerService"
diff --git a/app/src/main/java/org/emunix/unipatcher/Globals.java b/app/src/main/java/org/emunix/unipatcher/Globals.java
index c8c1b3e..74fdba0 100644
--- a/app/src/main/java/org/emunix/unipatcher/Globals.java
+++ b/app/src/main/java/org/emunix/unipatcher/Globals.java
@@ -1,5 +1,5 @@
 /*
-Copyright (C) 2013-2016 Boris Timofeev
+Copyright (C) 2013-2017 Boris Timofeev
 
 This file is part of UniPatcher.
 
@@ -20,9 +20,7 @@ along with UniPatcher.  If not, see <http://www.gnu.org/licenses/>.
 package org.emunix.unipatcher;
 
 public class Globals {
-    private static final String KEY = "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA384jTCBEuJ8nCWaC4S6AFrnMQN4mBlmkOXHV3Xg5hlFOl8TkVwiCfqz8r20yJpEy0IJ1+3QRnlq59zadUxbkD+PacJlGB/r2b3mbKfu+m0K+e/0aL6eWupjMSIyPgpnbN3uswiBEGUb4ytzYF53ZKTbLARnruQdMnjV6+VyfwMgpor/48anVQawDARBj/AIAj6VGtRHLmg6DmKDyOGQ7uCgXSv+ysnBKJjtIX/L/5nQgL8Q+9jsr2knuWY7j9BmrtpUXaDH3Kb50M1TOCKiqxPGa8lInOOIndABWxcpqmSMXP06SPYOanUlEH7lT0jjqpHpFNx8hRTT9xf652rgMJwIDAQAB";
     private static String cmdArgument = null;
-    private static boolean isFullVersion = false;
 
     public static String getCmdArgument() {
         return cmdArgument;
@@ -32,18 +30,6 @@ public class Globals {
         Globals.cmdArgument = cmdArgument;
     }
 
-    public static boolean isFullVersion() {
-        return isFullVersion;
-    }
-
-    public static void setFullVersion() {
-        isFullVersion = true;
-    }
-
-    public static String getKey() {
-        return KEY;
-    }
-
     public static final int ACTION_PATCHING = 1;
     public static final int ACTION_SMD_FIX_CHECKSUM = 2;
     public static final int ACTION_SNES_ADD_SMC_HEADER = 3;
diff --git a/app/src/main/java/org/emunix/unipatcher/Utils.java b/app/src/main/java/org/emunix/unipatcher/Utils.java
index 6b71564..912e2f8 100644
--- a/app/src/main/java/org/emunix/unipatcher/Utils.java
+++ b/app/src/main/java/org/emunix/unipatcher/Utils.java
@@ -1,5 +1,5 @@
 /*
-Copyright (C) 2013-2016 Boris Timofeev
+Copyright (C) 2013-2017 Boris Timofeev
 
 This file is part of UniPatcher.
 
@@ -24,8 +24,6 @@ import android.annotation.TargetApi;
 import android.content.Context;
 import android.content.pm.PackageInfo;
 import android.content.pm.PackageManager;
-import android.net.ConnectivityManager;
-import android.net.NetworkInfo;
 import android.os.Build;
 import android.os.StatFs;
 import android.support.v4.content.ContextCompat;
@@ -42,7 +40,6 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.nio.channels.FileChannel;
-import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Locale;
 
@@ -67,12 +64,6 @@ public class Utils {
                 == PackageManager.PERMISSION_GRANTED;
     }
 
-    public static boolean isOnline(Context context) {
-        ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
-        NetworkInfo netInfo = cm.getActiveNetworkInfo();
-        return netInfo != null && netInfo.isConnectedOrConnecting();
-    }
-
     public static int dpToPx(Context context, int dp) {
         DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics();
         return Math.round(dp * (displayMetrics.xdpi / DisplayMetrics.DENSITY_DEFAULT));
diff --git a/app/src/main/java/org/emunix/unipatcher/ui/activity/MainActivity.java b/app/src/main/java/org/emunix/unipatcher/ui/activity/MainActivity.java
index 8c2ef59..270f675 100644
--- a/app/src/main/java/org/emunix/unipatcher/ui/activity/MainActivity.java
+++ b/app/src/main/java/org/emunix/unipatcher/ui/activity/MainActivity.java
@@ -1,5 +1,5 @@
 /*
-Copyright (C) 2013-2016 Boris Timofeev
+Copyright (C) 2013-2017 Boris Timofeev
 
 This file is part of UniPatcher.
 
@@ -37,10 +37,7 @@ import android.support.v7.widget.Toolbar;
 import android.util.Log;
 import android.view.MenuItem;
 import android.view.View;
-import android.widget.Toast;
 
-import com.anjlab.android.iab.v3.BillingProcessor;
-import com.anjlab.android.iab.v3.TransactionDetails;
 import com.google.firebase.analytics.FirebaseAnalytics;
 
 import org.emunix.unipatcher.BuildConfig;
@@ -60,10 +57,6 @@ public class MainActivity extends AppCompatActivity
      implements NavigationView.OnNavigationItemSelectedListener {
     private static final String LOG_TAG = "org.emunix.unipatcher";
 
-    private static final String SKU_FULL = "full";
-    private static final String SKU_REMOVE_ADS = "ad";
-    private boolean readyToPurchase = false;
-    private BillingProcessor bp;
     private FirebaseAnalytics firebaseAnalytics;
 
     @Override
@@ -107,35 +100,6 @@ public class MainActivity extends AppCompatActivity
         }
 
         parseArgument();
-        bp = new BillingProcessor(this, Globals.getKey(), new BillingProcessor.IBillingHandler() {
-            @Override
-            public void onBillingInitialized() {
-                Log.d(LOG_TAG, "Billing initialized");
-                readyToPurchase = true;
-                if (bp.isPurchased(SKU_FULL) || bp.isPurchased(SKU_REMOVE_ADS)) {
-                    setFullVersion();
-                }
-            }
-            @Override
-            public void onProductPurchased(String productId, TransactionDetails details) {
-                Log.d(LOG_TAG, "Item purchased: " + productId);
-                complain(getString(R.string.purchase_successful));
-                setFullVersion();
-            }
-            @Override
-            public void onBillingError(int errorCode, Throwable error) {
-                if (errorCode != 110) // cancel purchase
-                    complain("Billing error: " + Integer.toString(errorCode));
-            }
-            @Override
-            public void onPurchaseHistoryRestored() {
-                for(String sku : bp.listOwnedProducts())
-                    Log.d(LOG_TAG, "Owned Managed Product: " + sku);
-                if (bp.isPurchased(SKU_FULL) || bp.isPurchased(SKU_REMOVE_ADS)) {
-                    setFullVersion();
-                }
-            }
-        });
         RateThisApp.launch(this);
     }
 
@@ -175,8 +139,9 @@ public class MainActivity extends AppCompatActivity
             startActivity(settingsIntent);
         } else if (id == R.id.nav_rate) {
             RateThisApp.rate(this);
-        } else if (id == R.id.nav_buy) {
-            buyFullVersion();
+        } else if (id == R.id.nav_donate) {
+            Intent donateIntent = new Intent(this, DonateActivity.class);
+            startActivity(donateIntent);
         } else if (id == R.id.nav_share) {
             shareApp();
         } else if (id == R.id.nav_help) {
@@ -211,13 +176,6 @@ public class MainActivity extends AppCompatActivity
         }
     }
 
-    @Override
-    protected void onActivityResult(int requestCode, int resultCode, Intent data){
-        Log.d(LOG_TAG, "onActivityResult(" + requestCode + "," + resultCode + "," + data);
-        if (!bp.handleActivityResult(requestCode, resultCode, data))
-            super.onActivityResult(requestCode, resultCode, data);
-    }
-
     private void shareApp() {
         Intent shareIntent = new Intent(Intent.ACTION_SEND);
         shareIntent.setType("text/plain");
@@ -225,28 +183,4 @@ public class MainActivity extends AppCompatActivity
         shareIntent.putExtra(Intent.EXTRA_TEXT, getString(R.string.share_text) + "https://play.google.com/store/apps/details?id=org.eminix.unipatcher");
         startActivity(Intent.createChooser(shareIntent, getString(R.string.share_dialog_title)));
     }
-
-    private void buyFullVersion() {
-        if (readyToPurchase)
-            bp.purchase(this, SKU_REMOVE_ADS);
-        else
-            complain("Billing not initialized.");
-    }
-
-    private void setFullVersion() {
-        Globals.setFullVersion();
-    }
-
-    private void complain(String message) {
-        Log.d(LOG_TAG, message);
-        Toast.makeText(this, message, Toast.LENGTH_LONG).show();
-    }
-
-    @Override
-    public void onDestroy() {
-        if (bp != null) {
-            bp.release();
-        }
-        super.onDestroy();
-    }
 }
diff --git a/app/src/main/res/layout/activity_donate.xml b/app/src/main/res/layout/activity_donate.xml
new file mode 100644
index 0000000..35c854b
--- /dev/null
+++ b/app/src/main/res/layout/activity_donate.xml
@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:fitsSystemWindows="true"
+    tools:context="org.emunix.unipatcher.ui.activity.DonateActivity">
+
+    <android.support.design.widget.AppBarLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:theme="@style/AppTheme.NoActionBar.AppBarOverlay">
+
+        <android.support.v7.widget.Toolbar
+            android:id="@+id/toolbar"
+            android:layout_width="match_parent"
+            android:layout_height="?attr/actionBarSize"
+            android:background="?attr/colorPrimary"
+            app:popupTheme="@style/AppTheme.NoActionBar.PopupOverlay" />
+
+    </android.support.design.widget.AppBarLayout>
+
+    <FrameLayout
+        android:id="@+id/donate_fragment"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        app:layout_behavior="@string/appbar_scrolling_view_behavior" />
+
+</android.support.design.widget.CoordinatorLayout>
diff --git a/app/src/main/res/menu/activity_main_drawer.xml b/app/src/main/res/menu/activity_main_drawer.xml
index e9e54c2..fec97d2 100644
--- a/app/src/main/res/menu/activity_main_drawer.xml
+++ b/app/src/main/res/menu/activity_main_drawer.xml
@@ -30,9 +30,9 @@
             android:icon="@drawable/ic_thumb_up_grey600_24dp"
             android:title="@string/nav_rate" />
         <item
-            android:id="@+id/nav_buy"
+            android:id="@+id/nav_donate"
             android:icon="@drawable/ic_shopping_cart_grey600_24dp"
-            android:title="@string/nav_buy" />
+            android:title="@string/nav_donate" />
         <item
             android:id="@+id/nav_share"
             android:icon="@drawable/ic_share_grey600_24dp"
diff --git a/app/src/main/res/values-it/strings.xml b/app/src/main/res/values-it/strings.xml
index 433ea4c..7eb5c9b 100644
--- a/app/src/main/res/values-it/strings.xml
+++ b/app/src/main/res/values-it/strings.xml
@@ -125,6 +125,8 @@
     <string name="help_activity_action_send_feedback">Invia feedback</string>
     <string name="help_activity_action_visit_site">Visita sito web</string>
 
+    <string name="donate_activity_title">Donate</string>
+
     <string name="send_feedback_dialog_title">Invia e-mail</string>
     <string name="send_feedback_error_no_email_apps">Non ci sono client email installati</string>
 
@@ -138,7 +140,7 @@
     <string name="nav_snes_add_del_smc_header">Aggiungi/Cancella intestazione SMC (SNES)</string>
     <string name="nav_settings">Impostazioni</string>
     <string name="nav_rate">Valuta questa App</string>
-    <string name="nav_buy">Offrimi una Birra</string>
+    <string name="nav_donate">Donate</string>
     <string name="nav_share">Condividi</string>
     <string name="nav_help">Aiuto</string>
     <string name="nav_drawer_open">Apri cassetto di navigazione</string>
@@ -150,7 +152,7 @@
     <string name="rate_dialog_ok">Valuta</string>
     <string name="rate_dialog_later">Ricorda dopo</string>
 
-    <string name="purchase_successful">Grazie!</string>
+    <string name="donation">Donation</string>
     <string name="icon">icona</string>
 
 </resources>
diff --git a/app/src/main/res/values-pl/strings.xml b/app/src/main/res/values-pl/strings.xml
index bd0cd7d..26dd0e8 100644
--- a/app/src/main/res/values-pl/strings.xml
+++ b/app/src/main/res/values-pl/strings.xml
@@ -125,6 +125,8 @@
     <string name="help_activity_action_send_feedback">Wyślij opinię</string>
     <string name="help_activity_action_visit_site">Odwiedź stronę</string>
 
+    <string name="donate_activity_title">Donate</string>
+
     <string name="send_feedback_dialog_title">Wyślij E-Maila</string>
     <string name="send_feedback_error_no_email_apps">Tu nie ma żadnych klientów E-Mail zainstalowanych</string>
 
@@ -137,7 +139,7 @@
     <string name="nav_snes_add_del_smc_header">Dodaj/Usuń nagłówek SMC (SNES)</string>
     <string name="nav_settings">Ustawienia</string>
     <string name="nav_rate">Oceń tą aplikację</string>
-    <string name="nav_buy">Kup Mi Piwo</string>
+    <string name="nav_donate">Donate</string>
     <string name="nav_share">Udostępnij</string>
     <string name="nav_help">Pomoc</string>
     <string name="nav_drawer_open">Otwórz kartę nawigacyjną</string>
@@ -149,7 +151,7 @@
     <string name="rate_dialog_ok">Oceń</string>
     <string name="rate_dialog_later">Przypomnij mi później</string>
 
-    <string name="purchase_successful">Dziękuję!</string>
+    <string name="donation">Donation</string>
     <string name="icon">ikona</string>
 
 </resources>
diff --git a/app/src/main/res/values-ru/strings.xml b/app/src/main/res/values-ru/strings.xml
index 7eaa883..6e28292 100644
--- a/app/src/main/res/values-ru/strings.xml
+++ b/app/src/main/res/values-ru/strings.xml
@@ -125,6 +125,8 @@
     <string name="help_activity_action_send_feedback">Написать письмо автору</string>
     <string name="help_activity_action_visit_site">Посетить веб-сайт</string>
 
+    <string name="donate_activity_title">Donate</string>
+
     <string name="send_feedback_dialog_title">Отправить e-mail</string>
     <string name="send_feedback_error_no_email_apps">Не установлен email клиент</string>
 
@@ -138,7 +140,7 @@
     <string name="nav_snes_add_del_smc_header">SMC заголовок (SNES)</string>
     <string name="nav_settings">Настройки</string>
     <string name="nav_rate">Оценить приложение</string>
-    <string name="nav_buy">Убрать рекламу</string>
+    <string name="nav_donate">Donate</string>
     <string name="nav_share">Рассказать друзьям</string>
     <string name="nav_help">Помощь</string>
     <string name="nav_drawer_open">Открыть главное меню</string>
@@ -150,7 +152,7 @@
     <string name="rate_dialog_ok">Поставить оценку</string>
     <string name="rate_dialog_later">Напомнить позже</string>
 
-    <string name="purchase_successful">Спасибо!</string>
+    <string name="donation">Donation</string>
     <string name="icon">иконка</string>
 
 </resources>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 1be7b78..4c2368b 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -125,6 +125,8 @@
     <string name="help_activity_action_send_feedback">Send feedback</string>
     <string name="help_activity_action_visit_site">Visit website</string>
 
+    <string name="donate_activity_title">Donate</string>
+
     <string name="send_feedback_dialog_title">Send e-mail</string>
     <string name="send_feedback_error_no_email_apps">There are no email clients installed</string>
 
@@ -137,7 +139,7 @@
     <string name="nav_snes_add_del_smc_header">Add/Del SMC header (SNES)</string>
     <string name="nav_settings">Settings</string>
     <string name="nav_rate">Rate this App</string>
-    <string name="nav_buy">Buy Me a Beer</string>
+    <string name="nav_donate">Donate</string>
     <string name="nav_share">Share</string>
     <string name="nav_help">Help</string>
     <string name="nav_drawer_open">Open navigation drawer</string>
@@ -149,7 +151,7 @@
     <string name="rate_dialog_ok">Rate</string>
     <string name="rate_dialog_later">Remind later</string>
 
-    <string name="purchase_successful">Thank you!</string>
+    <string name="donation">Donation</string>
     <string name="icon">icon</string>
 
 </resources>