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diff --git a/Example/Messaging/App/iOS/Data+MessagingExtensions.swift b/Example/Messaging/App/iOS/Data+MessagingExtensions.swift
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+++ b/Example/Messaging/App/iOS/Data+MessagingExtensions.swift
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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
+
+extension Data {
+  // Print Data as a string of bytes in hex, such as the common representation of APNs device tokens
+  // See: http://stackoverflow.com/a/40031342/9849
+  var hexByteString: String {
+    return self.map { String(format: "%02.2hhx", $0) }.joined()
+  }
+}