diff --git a/packages/firebase_core/firebase_core/android/src/main/java/io/flutter/plugins/firebase/core/FlutterFirebaseCorePlugin.java b/packages/firebase_core/firebase_core/android/src/main/java/io/flutter/plugins/firebase/core/FlutterFirebaseCorePlugin.java
index a1fed94439e3..fcdeb2a7f5ac 100644
--- a/packages/firebase_core/firebase_core/android/src/main/java/io/flutter/plugins/firebase/core/FlutterFirebaseCorePlugin.java
+++ b/packages/firebase_core/firebase_core/android/src/main/java/io/flutter/plugins/firebase/core/FlutterFirebaseCorePlugin.java
@@ -63,6 +63,7 @@ private GeneratedAndroidFirebaseCore.CoreFirebaseOptions firebaseOptionsToMap(
     firebaseOptions.setDatabaseURL(options.getDatabaseUrl());
     firebaseOptions.setStorageBucket(options.getStorageBucket());
     firebaseOptions.setTrackingId(options.getGaTrackingId());
+    // TODO(recaptchaSiteKey): Map recaptchaSiteKey if stored.
 
     return firebaseOptions.build();
   }
@@ -165,6 +166,8 @@ public void initializeApp(
               customAuthDomain.put(appName, initializeAppRequest.getAuthDomain());
             }
 
+            // TODO(recaptchaSiteKey): Store or use recaptchaSiteKey if needed.
+
             FirebaseApp firebaseApp =
                 FirebaseApp.initializeApp(applicationContext, options, appName);
             taskCompletionSource.setResult(Tasks.await(firebaseAppToMap(firebaseApp)));
diff --git a/packages/firebase_core/firebase_core/android/src/main/java/io/flutter/plugins/firebase/core/GeneratedAndroidFirebaseCore.java b/packages/firebase_core/firebase_core/android/src/main/java/io/flutter/plugins/firebase/core/GeneratedAndroidFirebaseCore.java
index b0a698faf51c..fdae685adbd8 100644
--- a/packages/firebase_core/firebase_core/android/src/main/java/io/flutter/plugins/firebase/core/GeneratedAndroidFirebaseCore.java
+++ b/packages/firebase_core/firebase_core/android/src/main/java/io/flutter/plugins/firebase/core/GeneratedAndroidFirebaseCore.java
@@ -377,6 +377,16 @@ public void setAppGroupId(@Nullable String setterArg) {
       this.appGroupId = setterArg;
     }
 
+    private @Nullable String recaptchaSiteKey;
+
+    public @Nullable String getRecaptchaSiteKey() {
+      return recaptchaSiteKey;
+    }
+
+    public void setRecaptchaSiteKey(@Nullable String setterArg) {
+      this.recaptchaSiteKey = setterArg;
+    }
+
     /** Constructor is non-public to enforce null safety; use Builder. */
     CoreFirebaseOptions() {}
 
@@ -402,7 +412,8 @@ && pigeonDeepEquals(deepLinkURLScheme, that.deepLinkURLScheme)
           && pigeonDeepEquals(androidClientId, that.androidClientId)
           && pigeonDeepEquals(iosClientId, that.iosClientId)
           && pigeonDeepEquals(iosBundleId, that.iosBundleId)
-          && pigeonDeepEquals(appGroupId, that.appGroupId);
+          && pigeonDeepEquals(appGroupId, that.appGroupId)
+          && pigeonDeepEquals(recaptchaSiteKey, that.recaptchaSiteKey);
     }
 
     @Override
@@ -423,7 +434,8 @@ public int hashCode() {
             androidClientId,
             iosClientId,
             iosBundleId,
-            appGroupId
+            appGroupId,
+            recaptchaSiteKey
           };
       return pigeonDeepHashCode(fields);
     }
@@ -542,6 +554,14 @@ public static final class Builder {
         return this;
       }
 
+      private @Nullable String recaptchaSiteKey;
+
+      @CanIgnoreReturnValue
+      public @NonNull Builder setRecaptchaSiteKey(@Nullable String setterArg) {
+        this.recaptchaSiteKey = setterArg;
+        return this;
+      }
+
       public @NonNull CoreFirebaseOptions build() {
         CoreFirebaseOptions pigeonReturn = new CoreFirebaseOptions();
         pigeonReturn.setApiKey(apiKey);
@@ -558,13 +578,14 @@ public static final class Builder {
         pigeonReturn.setIosClientId(iosClientId);
         pigeonReturn.setIosBundleId(iosBundleId);
         pigeonReturn.setAppGroupId(appGroupId);
+        pigeonReturn.setRecaptchaSiteKey(recaptchaSiteKey);
         return pigeonReturn;
       }
     }
 
     @NonNull
-    ArrayList<Object> toList() {
-      ArrayList<Object> toListResult = new ArrayList<>(14);
+    public ArrayList<Object> toList() {
+      ArrayList<Object> toListResult = new ArrayList<>(15);
       toListResult.add(apiKey);
       toListResult.add(appId);
       toListResult.add(messagingSenderId);
@@ -579,6 +600,7 @@ ArrayList<Object> toList() {
       toListResult.add(iosClientId);
       toListResult.add(iosBundleId);
       toListResult.add(appGroupId);
+      toListResult.add(recaptchaSiteKey);
       return toListResult;
     }
 
@@ -612,6 +634,8 @@ ArrayList<Object> toList() {
       pigeonResult.setIosBundleId((String) iosBundleId);
       Object appGroupId = pigeonVar_list.get(13);
       pigeonResult.setAppGroupId((String) appGroupId);
+      Object recaptchaSiteKey = pigeonVar_list.get(14);
+      pigeonResult.setRecaptchaSiteKey((String) recaptchaSiteKey);
       return pigeonResult;
     }
   }
@@ -740,7 +764,7 @@ public static final class Builder {
     }
 
     @NonNull
-    ArrayList<Object> toList() {
+    public ArrayList<Object> toList() {
       ArrayList<Object> toListResult = new ArrayList<>(4);
       toListResult.add(name);
       toListResult.add(options);
diff --git a/packages/firebase_core/firebase_core/ios/firebase_core/Sources/firebase_core/FLTFirebaseCorePlugin.m b/packages/firebase_core/firebase_core/ios/firebase_core/Sources/firebase_core/FLTFirebaseCorePlugin.m
index 23b3f7b9433b..b68d963b08c7 100644
--- a/packages/firebase_core/firebase_core/ios/firebase_core/Sources/firebase_core/FLTFirebaseCorePlugin.m
+++ b/packages/firebase_core/firebase_core/ios/firebase_core/Sources/firebase_core/FLTFirebaseCorePlugin.m
@@ -93,6 +93,7 @@ - (CoreFirebaseOptions *)optionsFromFIROptions:(FIROptions *)options {
   pigeonOptions.iosBundleId = (id)options.bundleID ?: [NSNull null];
   pigeonOptions.iosClientId = (id)options.clientID ?: [NSNull null];
   pigeonOptions.appGroupId = (id)options.appGroupID ?: [NSNull null];
+  // TODO(recaptchaSiteKey): Map recaptchaSiteKey if stored.
   return pigeonOptions;
 }
 
@@ -178,6 +179,8 @@ - (void)initializeAppAppName:(nonnull NSString *)appName
     options.appGroupID = initializeAppRequest.appGroupId;
   }
 
+  // TODO(recaptchaSiteKey): Store or use recaptchaSiteKey if needed.
+
   if (initializeAppRequest.authDomain != nil) {
     customAuthDomains[appNameIos] = initializeAppRequest.authDomain;
   }
diff --git a/packages/firebase_core/firebase_core/ios/firebase_core/Sources/firebase_core/include/firebase_core/messages.g.h b/packages/firebase_core/firebase_core/ios/firebase_core/Sources/firebase_core/include/firebase_core/messages.g.h
index 913fdbbd3e43..561383cc4135 100644
--- a/packages/firebase_core/firebase_core/ios/firebase_core/Sources/firebase_core/include/firebase_core/messages.g.h
+++ b/packages/firebase_core/firebase_core/ios/firebase_core/Sources/firebase_core/include/firebase_core/messages.g.h
@@ -32,7 +32,8 @@ NS_ASSUME_NONNULL_BEGIN
                androidClientId:(nullable NSString *)androidClientId
                    iosClientId:(nullable NSString *)iosClientId
                    iosBundleId:(nullable NSString *)iosBundleId
-                    appGroupId:(nullable NSString *)appGroupId;
+                    appGroupId:(nullable NSString *)appGroupId
+              recaptchaSiteKey:(nullable NSString *)recaptchaSiteKey;
 @property(nonatomic, copy) NSString *apiKey;
 @property(nonatomic, copy) NSString *appId;
 @property(nonatomic, copy) NSString *messagingSenderId;
@@ -47,6 +48,7 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, copy, nullable) NSString *iosClientId;
 @property(nonatomic, copy, nullable) NSString *iosBundleId;
 @property(nonatomic, copy, nullable) NSString *appGroupId;
+@property(nonatomic, copy, nullable) NSString *recaptchaSiteKey;
 @end
 
 @interface CoreInitializeResponse : NSObject
diff --git a/packages/firebase_core/firebase_core/ios/firebase_core/Sources/firebase_core/messages.g.m b/packages/firebase_core/firebase_core/ios/firebase_core/Sources/firebase_core/messages.g.m
index b1a0a1e69e45..449944316866 100644
--- a/packages/firebase_core/firebase_core/ios/firebase_core/Sources/firebase_core/messages.g.m
+++ b/packages/firebase_core/firebase_core/ios/firebase_core/Sources/firebase_core/messages.g.m
@@ -143,7 +143,8 @@ + (instancetype)makeWithApiKey:(NSString *)apiKey
                androidClientId:(nullable NSString *)androidClientId
                    iosClientId:(nullable NSString *)iosClientId
                    iosBundleId:(nullable NSString *)iosBundleId
-                    appGroupId:(nullable NSString *)appGroupId {
+                    appGroupId:(nullable NSString *)appGroupId
+              recaptchaSiteKey:(nullable NSString *)recaptchaSiteKey {
   CoreFirebaseOptions *pigeonResult = [[CoreFirebaseOptions alloc] init];
   pigeonResult.apiKey = apiKey;
   pigeonResult.appId = appId;
@@ -159,6 +160,7 @@ + (instancetype)makeWithApiKey:(NSString *)apiKey
   pigeonResult.iosClientId = iosClientId;
   pigeonResult.iosBundleId = iosBundleId;
   pigeonResult.appGroupId = appGroupId;
+  pigeonResult.recaptchaSiteKey = recaptchaSiteKey;
   return pigeonResult;
 }
 + (CoreFirebaseOptions *)fromList:(NSArray<id> *)list {
@@ -177,6 +179,7 @@ + (CoreFirebaseOptions *)fromList:(NSArray<id> *)list {
   pigeonResult.iosClientId = GetNullableObjectAtIndex(list, 11);
   pigeonResult.iosBundleId = GetNullableObjectAtIndex(list, 12);
   pigeonResult.appGroupId = GetNullableObjectAtIndex(list, 13);
+  pigeonResult.recaptchaSiteKey = GetNullableObjectAtIndex(list, 14);
   return pigeonResult;
 }
 + (nullable CoreFirebaseOptions *)nullableFromList:(NSArray<id> *)list {
@@ -198,6 +201,7 @@ + (nullable CoreFirebaseOptions *)nullableFromList:(NSArray<id> *)list {
     self.iosClientId ?: [NSNull null],
     self.iosBundleId ?: [NSNull null],
     self.appGroupId ?: [NSNull null],
+    self.recaptchaSiteKey ?: [NSNull null],
   ];
 }
 - (BOOL)isEqual:(id)object {
@@ -221,7 +225,8 @@ - (BOOL)isEqual:(id)object {
          FLTPigeonDeepEquals(self.androidClientId, other.androidClientId) &&
          FLTPigeonDeepEquals(self.iosClientId, other.iosClientId) &&
          FLTPigeonDeepEquals(self.iosBundleId, other.iosBundleId) &&
-         FLTPigeonDeepEquals(self.appGroupId, other.appGroupId);
+         FLTPigeonDeepEquals(self.appGroupId, other.appGroupId) &&
+         FLTPigeonDeepEquals(self.recaptchaSiteKey, other.recaptchaSiteKey);
 }
 
 - (NSUInteger)hash {
@@ -240,6 +245,7 @@ - (NSUInteger)hash {
   result = result * 31 + FLTPigeonDeepHash(self.iosClientId);
   result = result * 31 + FLTPigeonDeepHash(self.iosBundleId);
   result = result * 31 + FLTPigeonDeepHash(self.appGroupId);
+  result = result * 31 + FLTPigeonDeepHash(self.recaptchaSiteKey);
   return result;
 }
 @end
diff --git a/packages/firebase_core/firebase_core/windows/messages.g.cpp b/packages/firebase_core/firebase_core/windows/messages.g.cpp
index 42e8046a21e1..4bfc5dcbf9c4 100644
--- a/packages/firebase_core/firebase_core/windows/messages.g.cpp
+++ b/packages/firebase_core/firebase_core/windows/messages.g.cpp
@@ -257,7 +257,8 @@ CoreFirebaseOptions::CoreFirebaseOptions(
     const std::string* storage_bucket, const std::string* measurement_id,
     const std::string* tracking_id, const std::string* deep_link_u_r_l_scheme,
     const std::string* android_client_id, const std::string* ios_client_id,
-    const std::string* ios_bundle_id, const std::string* app_group_id)
+    const std::string* ios_bundle_id, const std::string* app_group_id,
+    const std::string* recaptcha_site_key)
     : api_key_(api_key),
       app_id_(app_id),
       messaging_sender_id_(messaging_sender_id),
@@ -287,7 +288,10 @@ CoreFirebaseOptions::CoreFirebaseOptions(
       ios_bundle_id_(ios_bundle_id ? std::optional<std::string>(*ios_bundle_id)
                                    : std::nullopt),
       app_group_id_(app_group_id ? std::optional<std::string>(*app_group_id)
-                                 : std::nullopt) {}
+                                 : std::nullopt),
+      recaptcha_site_key_(recaptcha_site_key
+                              ? std::optional<std::string>(*recaptcha_site_key)
+                              : std::nullopt) {}
 
 const std::string& CoreFirebaseOptions::api_key() const { return api_key_; }
 
@@ -453,9 +457,23 @@ void CoreFirebaseOptions::set_app_group_id(std::string_view value_arg) {
   app_group_id_ = value_arg;
 }
 
+const std::string* CoreFirebaseOptions::recaptcha_site_key() const {
+  return recaptcha_site_key_ ? &(*recaptcha_site_key_) : nullptr;
+}
+
+void CoreFirebaseOptions::set_recaptcha_site_key(
+    const std::string_view* value_arg) {
+  recaptcha_site_key_ =
+      value_arg ? std::optional<std::string>(*value_arg) : std::nullopt;
+}
+
+void CoreFirebaseOptions::set_recaptcha_site_key(std::string_view value_arg) {
+  recaptcha_site_key_ = value_arg;
+}
+
 EncodableList CoreFirebaseOptions::ToEncodableList() const {
   EncodableList list;
-  list.reserve(14);
+  list.reserve(15);
   list.push_back(EncodableValue(api_key_));
   list.push_back(EncodableValue(app_id_));
   list.push_back(EncodableValue(messaging_sender_id_));
@@ -481,6 +499,8 @@ EncodableList CoreFirebaseOptions::ToEncodableList() const {
                                 : EncodableValue());
   list.push_back(app_group_id_ ? EncodableValue(*app_group_id_)
                                : EncodableValue());
+  list.push_back(recaptcha_site_key_ ? EncodableValue(*recaptcha_site_key_)
+                                     : EncodableValue());
   return list;
 }
 
@@ -531,6 +551,11 @@ CoreFirebaseOptions CoreFirebaseOptions::FromEncodableList(
   if (!encodable_app_group_id.IsNull()) {
     decoded.set_app_group_id(std::get<std::string>(encodable_app_group_id));
   }
+  auto& encodable_recaptcha_site_key = list[14];
+  if (!encodable_recaptcha_site_key.IsNull()) {
+    decoded.set_recaptcha_site_key(
+        std::get<std::string>(encodable_recaptcha_site_key));
+  }
   return decoded;
 }
 
@@ -551,7 +576,9 @@ bool CoreFirebaseOptions::operator==(const CoreFirebaseOptions& other) const {
                                   other.android_client_id_) &&
          PigeonInternalDeepEquals(ios_client_id_, other.ios_client_id_) &&
          PigeonInternalDeepEquals(ios_bundle_id_, other.ios_bundle_id_) &&
-         PigeonInternalDeepEquals(app_group_id_, other.app_group_id_);
+         PigeonInternalDeepEquals(app_group_id_, other.app_group_id_) &&
+         PigeonInternalDeepEquals(recaptcha_site_key_,
+                                  other.recaptcha_site_key_);
 }
 
 bool CoreFirebaseOptions::operator!=(const CoreFirebaseOptions& other) const {
@@ -574,6 +601,7 @@ size_t CoreFirebaseOptions::Hash() const {
   result = result * 31 + PigeonInternalDeepHash(ios_client_id_);
   result = result * 31 + PigeonInternalDeepHash(ios_bundle_id_);
   result = result * 31 + PigeonInternalDeepHash(app_group_id_);
+  result = result * 31 + PigeonInternalDeepHash(recaptcha_site_key_);
   return result;
 }
 
diff --git a/packages/firebase_core/firebase_core/windows/messages.g.h b/packages/firebase_core/firebase_core/windows/messages.g.h
index bce0a6a81f24..a55996f5b067 100644
--- a/packages/firebase_core/firebase_core/windows/messages.g.h
+++ b/packages/firebase_core/firebase_core/windows/messages.g.h
@@ -76,7 +76,8 @@ class CoreFirebaseOptions {
       const std::string* storage_bucket, const std::string* measurement_id,
       const std::string* tracking_id, const std::string* deep_link_u_r_l_scheme,
       const std::string* android_client_id, const std::string* ios_client_id,
-      const std::string* ios_bundle_id, const std::string* app_group_id);
+      const std::string* ios_bundle_id, const std::string* app_group_id,
+      const std::string* recaptcha_site_key);
 
   const std::string& api_key() const;
   void set_api_key(std::string_view value_arg);
@@ -130,6 +131,10 @@ class CoreFirebaseOptions {
   void set_app_group_id(const std::string_view* value_arg);
   void set_app_group_id(std::string_view value_arg);
 
+  const std::string* recaptcha_site_key() const;
+  void set_recaptcha_site_key(const std::string_view* value_arg);
+  void set_recaptcha_site_key(std::string_view value_arg);
+
   bool operator==(const CoreFirebaseOptions& other) const;
   bool operator!=(const CoreFirebaseOptions& other) const;
   /// Returns a hash code value for the object. This method is supported for the
@@ -140,11 +145,9 @@ class CoreFirebaseOptions {
   static CoreFirebaseOptions FromEncodableList(
       const ::flutter::EncodableList& list);
 
- public:
  public:
   ::flutter::EncodableList ToEncodableList() const;
 
- private:
  private:
   friend class CoreInitializeResponse;
   friend class FirebaseCoreHostApi;
@@ -164,6 +167,7 @@ class CoreFirebaseOptions {
   std::optional<std::string> ios_client_id_;
   std::optional<std::string> ios_bundle_id_;
   std::optional<std::string> app_group_id_;
+  std::optional<std::string> recaptcha_site_key_;
 };
 
 // Generated class from Pigeon that represents data sent in messages.
@@ -209,11 +213,9 @@ class CoreInitializeResponse {
   static CoreInitializeResponse FromEncodableList(
       const ::flutter::EncodableList& list);
 
- public:
  public:
   ::flutter::EncodableList ToEncodableList() const;
 
- private:
  private:
   friend class FirebaseCoreHostApi;
   friend class FirebaseAppHostApi;
diff --git a/packages/firebase_core/firebase_core_platform_interface/lib/src/firebase_options.dart b/packages/firebase_core/firebase_core_platform_interface/lib/src/firebase_options.dart
index ad0e580e88a8..dbc740a71ffe 100644
--- a/packages/firebase_core/firebase_core_platform_interface/lib/src/firebase_options.dart
+++ b/packages/firebase_core/firebase_core_platform_interface/lib/src/firebase_options.dart
@@ -50,6 +50,7 @@ class FirebaseOptions {
     this.iosClientId,
     this.iosBundleId,
     this.appGroupId,
+    this.recaptchaSiteKey,
   });
 
   /// Named constructor to create [FirebaseOptions] from a the response of Pigeon channel.
@@ -71,7 +72,8 @@ class FirebaseOptions {
         androidClientId = options.androidClientId,
         iosClientId = options.iosClientId,
         iosBundleId = options.iosBundleId,
-        appGroupId = options.appGroupId;
+        appGroupId = options.appGroupId,
+        recaptchaSiteKey = options.recaptchaSiteKey;
 
   /// Returns a copy of this FirebaseOptions with the given fields replaced with
   /// the new values.
@@ -90,6 +92,7 @@ class FirebaseOptions {
     String? iosClientId,
     String? iosBundleId,
     String? appGroupId,
+    String? recaptchaSiteKey,
   }) {
     return FirebaseOptions(
       apiKey: apiKey ?? this.apiKey,
@@ -106,6 +109,7 @@ class FirebaseOptions {
       iosClientId: iosClientId ?? this.iosClientId,
       iosBundleId: iosBundleId ?? this.iosBundleId,
       appGroupId: appGroupId ?? this.appGroupId,
+      recaptchaSiteKey: recaptchaSiteKey ?? this.recaptchaSiteKey,
     );
   }
 
@@ -174,6 +178,9 @@ class FirebaseOptions {
   /// This property is used on iOS only.
   final String? appGroupId;
 
+  /// The reCAPTCHA site key used for App Check.
+  final String? recaptchaSiteKey;
+
   /// The current instance as a [Map].
   Map<String, String?> get asMap {
     return <String, String?>{
@@ -191,6 +198,7 @@ class FirebaseOptions {
       'iosClientId': iosClientId,
       'iosBundleId': iosBundleId,
       'appGroupId': appGroupId,
+      'recaptchaSiteKey': recaptchaSiteKey,
     };
   }
 
diff --git a/packages/firebase_core/firebase_core_platform_interface/lib/src/pigeon/messages.pigeon.dart b/packages/firebase_core/firebase_core_platform_interface/lib/src/pigeon/messages.pigeon.dart
index 6d4123a1f1cb..9bb893bb3aba 100644
--- a/packages/firebase_core/firebase_core_platform_interface/lib/src/pigeon/messages.pigeon.dart
+++ b/packages/firebase_core/firebase_core_platform_interface/lib/src/pigeon/messages.pigeon.dart
@@ -126,6 +126,7 @@ class CoreFirebaseOptions {
     this.iosClientId,
     this.iosBundleId,
     this.appGroupId,
+    this.recaptchaSiteKey,
   });
 
   String apiKey;
@@ -156,6 +157,8 @@ class CoreFirebaseOptions {
 
   String? appGroupId;
 
+  String? recaptchaSiteKey;
+
   List<Object?> _toList() {
     return <Object?>[
       apiKey,
@@ -172,6 +175,7 @@ class CoreFirebaseOptions {
       iosClientId,
       iosBundleId,
       appGroupId,
+      recaptchaSiteKey,
     ];
   }
 
@@ -196,6 +200,7 @@ class CoreFirebaseOptions {
       iosClientId: result[11] as String?,
       iosBundleId: result[12] as String?,
       appGroupId: result[13] as String?,
+      recaptchaSiteKey: result[14] as String?,
     );
   }
 
@@ -221,7 +226,8 @@ class CoreFirebaseOptions {
         _deepEquals(androidClientId, other.androidClientId) &&
         _deepEquals(iosClientId, other.iosClientId) &&
         _deepEquals(iosBundleId, other.iosBundleId) &&
-        _deepEquals(appGroupId, other.appGroupId);
+        _deepEquals(appGroupId, other.appGroupId) &&
+        _deepEquals(recaptchaSiteKey, other.recaptchaSiteKey);
   }
 
   @override
diff --git a/packages/firebase_core/firebase_core_platform_interface/pigeons/messages.dart b/packages/firebase_core/firebase_core_platform_interface/pigeons/messages.dart
index a2286f54f1a9..a42278d0f4e7 100644
--- a/packages/firebase_core/firebase_core_platform_interface/pigeons/messages.dart
+++ b/packages/firebase_core/firebase_core_platform_interface/pigeons/messages.dart
@@ -44,6 +44,7 @@ class CoreFirebaseOptions {
     required this.databaseURL,
     required this.storageBucket,
     required this.trackingId,
+    required this.recaptchaSiteKey,
   });
 
   final String apiKey;
@@ -73,6 +74,8 @@ class CoreFirebaseOptions {
   final String? iosBundleId;
 
   final String? appGroupId;
+
+  final String? recaptchaSiteKey;
 }
 
 class CoreInitializeResponse {
diff --git a/packages/firebase_core/firebase_core_platform_interface/test/firebase_options_test.dart b/packages/firebase_core/firebase_core_platform_interface/test/firebase_options_test.dart
index 8b84f78e9525..91f66e2a03c0 100644
--- a/packages/firebase_core/firebase_core_platform_interface/test/firebase_options_test.dart
+++ b/packages/firebase_core/firebase_core_platform_interface/test/firebase_options_test.dart
@@ -91,6 +91,7 @@ void main() {
         iosClientId: 'newIosClientId',
         iosBundleId: 'newIosBundleId',
         appGroupId: 'newAppGroupId',
+        recaptchaSiteKey: 'newRecaptchaSiteKey',
       );
 
       expect(
@@ -110,6 +111,7 @@ void main() {
           iosClientId: 'newIosClientId',
           iosBundleId: 'newIosBundleId',
           appGroupId: 'newAppGroupId',
+          recaptchaSiteKey: 'newRecaptchaSiteKey',
         ),
       );
     });
@@ -130,6 +132,7 @@ void main() {
         iosBundleId: 'iosBundleId',
         iosClientId: 'iosClientId',
         appGroupId: 'appGroupId',
+        recaptchaSiteKey: 'recaptchaSiteKey',
       );
 
       expect(options.asMap, {
@@ -147,6 +150,7 @@ void main() {
         'iosBundleId': 'iosBundleId',
         'iosClientId': 'iosClientId',
         'appGroupId': 'appGroupId',
+        'recaptchaSiteKey': 'recaptchaSiteKey',
       });
     });
   });
diff --git a/packages/firebase_core/firebase_core_web/lib/src/firebase_core_web.dart b/packages/firebase_core/firebase_core_web/lib/src/firebase_core_web.dart
index a3ae6f933db6..f649fa1a2f5e 100644
--- a/packages/firebase_core/firebase_core_web/lib/src/firebase_core_web.dart
+++ b/packages/firebase_core/firebase_core_web/lib/src/firebase_core_web.dart
@@ -334,6 +334,7 @@ class FirebaseCoreWeb extends FirebasePlatform {
 
         // At this point, there is no default app so we need to create it with
         // the users options.
+        // TODO(recaptchaSiteKey): Pass recaptchaSiteKey if supported.
         app = firebase.initializeApp(
           apiKey: options!.apiKey,
           authDomain: options.authDomain,
@@ -355,6 +356,7 @@ class FirebaseCoreWeb extends FirebasePlatform {
       );
 
       try {
+        // TODO(recaptchaSiteKey): Pass recaptchaSiteKey if supported.
         app = firebase.initializeApp(
           name: name,
           apiKey: options!.apiKey,