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diff --git a/Firebase/Auth/Source/Private/FIRAuthAppCredential.h b/Firebase/Auth/Source/Private/FIRAuthAppCredential.h
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+++ b/Firebase/Auth/Source/Private/FIRAuthAppCredential.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.
+ */
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+/** @class FIRAuthAppCredential
+    @brief A class represents a credential that proves the identity of the app.
+ */
+@interface FIRAuthAppCredential : NSObject <NSSecureCoding>
+
+/** @property receipt
+    @brief The server acknowledgement of receiving client's claim of identity.
+ */
+@property(nonatomic, strong, readonly) NSString *receipt;
+
+/** @property secret
+    @brief The secret that the client received from server via a trusted channel, if ever.
+ */
+@property(nonatomic, strong, readonly, nullable) NSString *secret;
+
+/** @fn initWithReceipt:secret:
+    @brief Initializes the instance.
+    @param receipt The server acknowledgement of receiving client's claim of identity.
+    @param secret The secret that the client received from server via a trusted channel, if ever.
+    @return The initialized instance.
+ */
+- (instancetype)initWithReceipt:(NSString *)receipt secret:(nullable NSString *)secret
+    NS_DESIGNATED_INITIALIZER;
+
+/** @fn init
+    @brief Call @c initWithReceipt:secret: to get an instance of this class.
+ */
+- (instancetype)init NS_UNAVAILABLE;
+
+
+@end
+
+NS_ASSUME_NONNULL_END