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diff --git a/Firebase/Messaging/InternalHeaders/FIRMessagingInternalUtilities.h b/Firebase/Messaging/InternalHeaders/FIRMessagingInternalUtilities.h
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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.
+ */
+
+/// @file FIRMessagingInternalUtilities.h
+///
+/// Internal Class Names and Methods that other libs can query at runtime.
+
+/// FIRMessaging Class that responds to the FIRMessaging SDK version selector.
+/// Verify at runtime if the class exists and implements the
+/// required method.
+static NSString *const kFIRMessagingSDKClassString = @"FIRMessaging";
+
+/// FIRMessaging selector that returns the current FIRMessaging library version.
+static NSString *const kFIRMessagingSDKVersionSelectorString = @"FIRMessagingSDKVersion";
+
+/// FIRMessaging selector that returns the current device locale.
+static NSString *const kFIRMessagingSDKLocaleSelectorString = @"FIRMessagingSDKCurrentLocale";