diff --git a/build.gradle b/build.gradle
index 92339b13f2..09ce866bfe 100644
--- a/build.gradle
+++ b/build.gradle
@@ -15,6 +15,7 @@ buildscript {
     ext.biometricVersion = '1.1.0'
     ext.coreVersion = '1.12.0'
     ext.fragmentVersion = '1.6.2'
+    ext.gsonVersion = '2.10.1'
     ext.lifecycleVersion = '2.7.0'
     ext.loaderVersion = '1.1.0'
     ext.materialVersion = '1.11.0'
diff --git a/play-services-core/build.gradle b/play-services-core/build.gradle
index a2bdcd4a8d..1642b050da 100644
--- a/play-services-core/build.gradle
+++ b/play-services-core/build.gradle
@@ -79,6 +79,9 @@ dependencies {
     implementation "androidx.preference:preference-ktx:$preferenceVersion"
     implementation "androidx.webkit:webkit:$webkitVersion"
 
+    // Gson
+    implementation "com.google.code.gson:gson:$gsonVersion"
+
     // Material Components
     implementation "com.google.android.material:material:$materialVersion"
 
diff --git a/play-services-core/src/main/java/org/microg/gms/checkin/CheckinManager.java b/play-services-core/src/main/java/org/microg/gms/checkin/CheckinManager.java
index 1604ed2565..32b5af968a 100644
--- a/play-services-core/src/main/java/org/microg/gms/checkin/CheckinManager.java
+++ b/play-services-core/src/main/java/org/microg/gms/checkin/CheckinManager.java
@@ -20,6 +20,12 @@
 import android.accounts.AccountManager;
 import android.content.ContentResolver;
 import android.content.Context;
+import android.content.SharedPreferences;
+
+import androidx.annotation.Nullable;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
 
 import org.microg.gms.auth.AuthConstants;
 import org.microg.gms.auth.AuthRequest;
@@ -33,6 +39,10 @@
 import java.util.List;
 
 public class CheckinManager {
+
+    private static final String LAST_CHECK_IN_DATA = "LAST_CHECK_IN_DATA";
+    private static final String CHECK_IN_PREF = "check_in";
+
     private static final long MIN_CHECKIN_INTERVAL = 3 * 60 * 60 * 1000; // 3 hours
 
     @SuppressWarnings("MissingPermission")
@@ -42,7 +52,20 @@ public static synchronized LastCheckinInfo checkin(Context context, boolean forc
             return null;
         if (!CheckinPreferences.isEnabled(context))
             return null;
-        List<CheckinClient.Account> accounts = new ArrayList<CheckinClient.Account>();
+        CheckinRequest checkinRequest = getCheckinRequest(context, info);
+        saveLastCheckInRequest(context, checkinRequest);
+        return handleResponse(context, CheckinClient.request(checkinRequest));
+    }
+
+    @Nullable
+    public static String getLastRawCheckInRequest(Context context) {
+        String rawCheckInRequest = getCheckInSharedPreferences(context)
+                .getString(LAST_CHECK_IN_DATA, "");
+        return !rawCheckInRequest.isEmpty() ? rawCheckInRequest : null;
+    }
+
+    private static CheckinRequest getCheckinRequest(Context context, LastCheckinInfo info) throws IOException {
+        List<CheckinClient.Account> accounts = new ArrayList<>();
         AccountManager accountManager = AccountManager.get(context);
         String accountType = AuthConstants.DEFAULT_ACCOUNT_TYPE;
         for (Account account : accountManager.getAccountsByType(accountType)) {
@@ -55,10 +78,9 @@ public static synchronized LastCheckinInfo checkin(Context context, boolean forc
                 accounts.add(new CheckinClient.Account(account.name, token));
             }
         }
-        CheckinRequest request = CheckinClient.makeRequest(context,
+        return CheckinClient.makeRequest(context,
                 new DeviceConfiguration(context), Utils.getDeviceIdentifier(context),
                 Utils.getPhoneInfo(context), info, Utils.getLocale(context), accounts);
-        return handleResponse(context, CheckinClient.request(request));
     }
 
     private static LastCheckinInfo handleResponse(Context context, CheckinResponse response) {
@@ -72,4 +94,20 @@ private static LastCheckinInfo handleResponse(Context context, CheckinResponse r
 
         return info;
     }
+
+    private static void saveLastCheckInRequest(Context context, CheckinRequest checkinRequest) {
+        getCheckInSharedPreferences(context).edit()
+                .putString(LAST_CHECK_IN_DATA, getGsonInstance().toJson(checkinRequest))
+                .apply();
+    }
+
+    private static SharedPreferences getCheckInSharedPreferences(Context context) {
+        return context.getSharedPreferences(CHECK_IN_PREF, Context.MODE_PRIVATE);
+    }
+
+    private static Gson getGsonInstance() {
+        return new GsonBuilder()
+                .setPrettyPrinting()
+                .create();
+    }
 }
diff --git a/play-services-core/src/main/kotlin/org/microg/gms/ui/DeviceRegistrationFragment.kt b/play-services-core/src/main/kotlin/org/microg/gms/ui/DeviceRegistrationFragment.kt
index b7d7e9c8ad..4e38dcc9bf 100644
--- a/play-services-core/src/main/kotlin/org/microg/gms/ui/DeviceRegistrationFragment.kt
+++ b/play-services-core/src/main/kotlin/org/microg/gms/ui/DeviceRegistrationFragment.kt
@@ -19,6 +19,8 @@ import androidx.preference.Preference
 import androidx.preference.PreferenceCategory
 import androidx.preference.PreferenceFragmentCompat
 import com.google.android.gms.R
+import com.google.android.material.dialog.MaterialAlertDialogBuilder
+import org.microg.gms.checkin.CheckinManager
 import org.microg.gms.checkin.CheckinPreferences
 import org.microg.gms.checkin.getCheckinServiceInfo
 import org.microg.gms.profile.ProfileManager
@@ -94,6 +96,17 @@ class DeviceRegistrationFragment : PreferenceFragmentCompat() {
             CheckinPreferences.setEnabled(requireContext(), newStatus)
             true
         }
+
+        findPreference<Preference>("pref_device_registration_data")?.setOnPreferenceClickListener {
+            val rawCheckInRequest = CheckinManager.getLastRawCheckInRequest(context)
+            MaterialAlertDialogBuilder(it.context)
+                .setTitle(R.string.pref_device_registration_data_title)
+                .setMessage(rawCheckInRequest ?: getString(R.string.data_na))
+                .setPositiveButton(android.R.string.ok) { dialog, _ -> dialog.dismiss() }
+                .create()
+                .show()
+            true
+        }
     }
 
     private fun configureProfilePreference() {
diff --git a/play-services-core/src/main/res/values/strings.xml b/play-services-core/src/main/res/values/strings.xml
index bbe47e70a9..7f4847b658 100644
--- a/play-services-core/src/main/res/values/strings.xml
+++ b/play-services-core/src/main/res/values/strings.xml
@@ -116,6 +116,7 @@ This can take a couple of minutes."</string>
     <string name="self_check_resolution_battery_optimizations">Touch here to disable battery optimizations. Not doing this may result in misbehaving applications.</string>
 
     <!-- Settings strings -->
+    <string name="data_na">No data available right now</string>
 
     <string name="prefcat_about">About</string>
     <string name="prefcat_components">Components</string>
@@ -146,6 +147,9 @@ This can take a couple of minutes."</string>
     <string name="pref_checkin_enable_summary">Registers your device to Google services and creates a unique device identifier. microG strips identifying bits other than your Google account name from registration data.</string>
     <string name="pref_device_registration_android_id">Android ID</string>
 
+    <string name="pref_device_registration_data_title">Device registration data</string>
+    <string name="pref_device_registration_data_summary">Check data shared with Google servers for device registration</string>
+
     <string name="checkin_not_registered">Not registered</string>
     <string name="checkin_last_registration">Last registration: <xliff:g example="Yesterday, 02:20 PM">%1$s</xliff:g></string>
     <string name="checkin_enable_switch">Register device</string>
diff --git a/play-services-core/src/main/res/xml/preferences_device_registration.xml b/play-services-core/src/main/res/xml/preferences_device_registration.xml
index b4d290b93b..8ab4140371 100644
--- a/play-services-core/src/main/res/xml/preferences_device_registration.xml
+++ b/play-services-core/src/main/res/xml/preferences_device_registration.xml
@@ -50,6 +50,11 @@
             android:title="@string/pref_device_registration_android_id"
             tools:summary="1953a59d1c1b7e4b"
             app:iconSpaceReserved="false" />
+        <Preference
+            android:key="pref_device_registration_data"
+            android:summary="@string/pref_device_registration_data_summary"
+            android:title="@string/pref_device_registration_data_title"
+            app:iconSpaceReserved="false" />
     </PreferenceCategory>
     <PreferenceCategory android:layout="@layout/preference_category_no_label">
         <org.microg.gms.ui.FooterPreference