diff --git a/features/support/env.rb b/features/support/env.rb
index 7f55fd1b7..d3ac761bf 100644
--- a/features/support/env.rb
+++ b/features/support/env.rb
@@ -64,8 +64,6 @@
 
 BeforeAll do
   $api_key = 'a35a2a72bd230ac0aa0f52715bbdc6aa'
-  Maze.config.enforce_bugsnag_integrity = false
-
   if Maze.config.os&.downcase == 'macos'
     # The default macOS Crash Reporter "#{app_name} quit unexpectedly" alert grabs focus which can cause tests to flake.
     # This option, which appears to have been introduced in macOS 10.11, displays a notification instead of the alert.
diff --git a/src/BugsnagUnity/Delivery.cs b/src/BugsnagUnity/Delivery.cs
index 2057f387f..55b8601fd 100644
--- a/src/BugsnagUnity/Delivery.cs
+++ b/src/BugsnagUnity/Delivery.cs
@@ -9,6 +9,7 @@
 using BugsnagUnity.Payload;
 using UnityEngine;
 using UnityEngine.Networking;
+using System.Security.Cryptography;
 
 namespace BugsnagUnity
 {
@@ -187,6 +188,8 @@ IEnumerator PushToServer(IPayload payload)
             {
                 req.SetRequestHeader("Content-Type", "application/json");
                 req.SetRequestHeader("Bugsnag-Sent-At", DateTimeOffset.Now.ToString("o", CultureInfo.InvariantCulture));
+                req.SetRequestHeader("Bugsnag-Integrity", "sha1 " + Hash(body));
+
                 foreach (var header in payload.Headers)
                 {
                     req.SetRequestHeader(header.Key, header.Value);
@@ -278,6 +281,20 @@ private byte[] PrepareEventBodySimple(IPayload payload)
             return serialisedPayload;
         }
 
+        private string Hash(byte[] input)
+        {
+            using (SHA1Managed sha1 = new SHA1Managed())
+            {
+                var hash = sha1.ComputeHash(input);
+                var sb = new StringBuilder(hash.Length * 2);
+                foreach (byte b in hash)
+                {
+                    sb.Append(b.ToString("x2"));
+                }
+                return sb.ToString();
+            }
+        }
+
         private bool TruncateBreadcrumbs(Dictionary<string, object> @event, int bytesToRemove)
         {
             var breadcrumbsList = (@event[EVENT_KEY_BREADCRUMBS] as Dictionary<string, object>[]).ToList();