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diff --git a/Firebase/Messaging/FIRMessaging+FIRApp.m b/Firebase/Messaging/FIRMessaging+FIRApp.m
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+++ b/Firebase/Messaging/FIRMessaging+FIRApp.m
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+/*
+ * Copyright 2017 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import "FIRMessaging+FIRApp.h"
+
+#import "FIRAppInternal.h"
+#import "FIROptionsInternal.h"
+
+#import "FIRMessagingConfig.h"
+#import "FIRMessagingConstants.h"
+#import "FIRMessagingLogger.h"
+#import "FIRMessagingPubSub.h"
+#import "FIRMessagingRemoteNotificationsProxy.h"
+#import "FIRMessagingVersionUtilities.h"
+#import "FIRMessaging_Private.h"
+
+@interface FIRMessaging ()
+
+@property(nonatomic, readwrite, strong) NSString *fcmSenderID;
+
+@end
+
+@implementation FIRMessaging (FIRApp)
+
++ (void)load {
+  // FIRMessaging by default removes itself from observing any notifications.
+  [[NSNotificationCenter defaultCenter] addObserver:self
+                                           selector:@selector(didReceiveConfigureSDKNotification:)
+                                               name:kFIRAppReadyToConfigureSDKNotification
+                                             object:[FIRApp class]];
+}
+
++ (void)didReceiveConfigureSDKNotification:(NSNotification *)notification {
+  NSDictionary *appInfoDict = notification.userInfo;
+  NSString *appName = appInfoDict[kFIRAppNameKey];
+  FIRApp *app = [FIRApp appNamed:appName];
+  [[FIRMessaging messaging] configureMessaging:app];
+}
+
+- (void)configureMessaging:(FIRApp *)app {
+  FIROptions *options = app.options;
+  NSError *error;
+  if (!options.GCMSenderID.length) {
+    error =
+        [FIRApp errorForSubspecConfigurationFailureWithDomain:kFirebaseCloudMessagingErrorDomain
+                                                    errorCode:FIRErrorCodeCloudMessagingFailed
+                                                      service:kFIRServiceMessaging
+                                                       reason:@"Google Sender ID must not be nil"
+                                                              @" or empty."];
+    [self exitApp:app withError:error];
+    return;
+  }
+
+  self.fcmSenderID = [options.GCMSenderID copy];
+
+  // Swizzle remote-notification-related methods (app delegate and UNUserNotificationCenter)
+  if ([FIRMessagingRemoteNotificationsProxy canSwizzleMethods]) {
+    FIRMessagingLoggerNotice(kFIRMessagingMessageCodeFIRApp000,
+                             @"FIRMessaging Remote Notifications proxy enabled, will swizzle "
+                             @"remote notification receiver handlers. Add \"%@\" to your "
+                             @"Info.plist and set it to NO",
+                             kFIRMessagingRemoteNotificationsProxyEnabledInfoPlistKey);
+    [FIRMessagingRemoteNotificationsProxy swizzleMethods];
+  }
+}
+
+- (void)exitApp:(FIRApp *)app withError:(NSError *)error {
+  [app sendLogsWithServiceName:kFIRServiceMessaging
+                       version:FIRMessagingCurrentLibraryVersion()
+                         error:error];
+  if (error) {
+    NSString *message = nil;
+    if (app.options.usingOptionsFromDefaultPlist) {
+      // Configured using plist file
+      message = [NSString stringWithFormat:@"Firebase Messaging has stopped your project because "
+                    @"there are missing or incorrect values provided in %@.%@ that may prevent "
+                    @"your app from behaving as expected:\n\n"
+                    @"Error: %@\n\n"
+                    @"Please fix these issues to ensure that Firebase is correctly configured in "
+                    @"your project.",
+                    kServiceInfoFileName,
+                    kServiceInfoFileType,
+                    error.localizedFailureReason];
+    } else {
+      // Configured manually
+      message = [NSString stringWithFormat:@"Firebase Messaging has stopped your project because "
+                    @"there are missing or incorrect values in Firebase's configuration options "
+                    @"that may prevent your app from behaving as expected:\n\n"
+                    @"Error:%@\n\n"
+                    @"Please fix these issues to ensure that Firebase is correctly configured in "
+                    @"your project.",
+                    error.localizedFailureReason];
+    }
+    [NSException raise:kFirebaseCloudMessagingErrorDomain format:@"%@", message];
+  }
+}
+
+@end