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diff --git a/Interop/Auth/Public/FIRAuthInterop.h b/Interop/Auth/Public/FIRAuthInterop.h
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+++ b/Interop/Auth/Public/FIRAuthInterop.h
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+/*
+ * Copyright 2018 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.
+ */
+
+#ifndef FIRAuthInterop_h
+#define FIRAuthInterop_h
+
+NS_ASSUME_NONNULL_BEGIN
+
+/** @typedef FIRTokenCallback
+ @brief The type of block which gets called when a token is ready.
+ */
+typedef void (^FIRTokenCallback)(NSString *_Nullable token, NSError *_Nullable error)
+    NS_SWIFT_NAME(TokenCallback);
+
+/// Common methods for Auth interoperability.
+NS_SWIFT_NAME(AuthInterop)
+@protocol FIRAuthInterop
+
+/// Retrieves the Firebase authentication token, possibly refreshing it if it has expired.
+- (void)getTokenForcingRefresh:(BOOL)forceRefresh withCallback:(FIRTokenCallback)callback;
+
+/// Get the current Auth user's UID. Returns nil if there is no user signed in.
+- (nullable NSString *)getUserID;
+
+@end
+
+NS_ASSUME_NONNULL_END
+
+#endif /* FIRAuthInterop_h */