diff --git a/internal/platform/BUILD b/internal/platform/BUILD
index 7de29f48..5cfbbbb5 100644
--- a/internal/platform/BUILD
+++ b/internal/platform/BUILD
@@ -47,8 +47,10 @@ cc_library(
         "//connections:__subpackages__",
         "//fastpair:__subpackages__",
         "//internal:__pkg__",
+        "//internal/auth:__subpackages__",
         "//internal/platform:__subpackages__",
         "//internal/platform/implementation:__subpackages__",
+        "//internal/preferences:__subpackages__",
         "//internal/weave:__pkg__",
         "//location/nearby/cpp:__subpackages__",
         "//presence:__subpackages__",
@@ -348,6 +350,7 @@ cc_library(
         "//internal/flags:__subpackages__",
         "//internal/network:__subpackages__",
         "//internal/platform/implementation/windows:__subpackages__",
+        "//internal/preferences:__subpackages__",
         "//internal/test:__subpackages__",
         "//internal/weave:__pkg__",
         "//location/nearby/cpp:__subpackages__",
diff --git a/internal/platform/implementation/BUILD b/internal/platform/implementation/BUILD
index 66a0f5b7..f6a47890 100644
--- a/internal/platform/implementation/BUILD
+++ b/internal/platform/implementation/BUILD
@@ -43,6 +43,7 @@ cc_library(
         "//internal/crypto:__pkg__",
         "//internal/platform:__pkg__",
         "//internal/platform/implementation:__subpackages__",
+        "//internal/preferences:__subpackages__",
         "//internal/test:__subpackages__",
         "//location/nearby/analytics/cpp:__subpackages__",
         "//location/nearby/cpp/common:__subpackages__",
diff --git a/internal/platform/implementation/apple/platform.mm b/internal/platform/implementation/apple/platform.mm
index d35d6b81..f8de03e6 100644
--- a/internal/platform/implementation/apple/platform.mm
+++ b/internal/platform/implementation/apple/platform.mm
@@ -28,6 +28,7 @@
 #import "internal/platform/implementation/apple/log_message.h"
 #import "internal/platform/implementation/apple/multi_thread_executor.h"
 #include "internal/platform/implementation/apple/mutex.h"
+#include "internal/platform/implementation/apple/preferences_repository.h"
 #import "internal/platform/implementation/apple/scheduled_executor.h"
 #import "internal/platform/implementation/apple/single_thread_executor.h"
 #include "internal/platform/implementation/apple/timer.h"
@@ -246,5 +247,11 @@ std::unique_ptr<nearby::api::DeviceInfo> ImplementationPlatform::CreateDeviceInf
   return std::make_unique<apple::DeviceInfo>();
 }
 
+// TODO(b/261503919): Add implementation.
+std::unique_ptr<nearby::api::PreferencesRepository>
+ImplementationPlatform::CreatePreferencesRepository(absl::string_view path) {
+  return std::make_unique<apple::PreferencesRepository>(path);
+}
+
 }  // namespace api
 }  // namespace nearby
diff --git a/internal/platform/implementation/g3/BUILD b/internal/platform/implementation/g3/BUILD
index 81df8931..8dc1300b 100644
--- a/internal/platform/implementation/g3/BUILD
+++ b/internal/platform/implementation/g3/BUILD
@@ -139,6 +139,7 @@ cc_library(
         "//internal/flags:__subpackages__",
         "//internal/network:__subpackages__",
         "//internal/platform:__subpackages__",
+        "//internal/preferences:__subpackages__",
         "//internal/proto/analytics:__subpackages__",
         "//internal/test:__subpackages__",
         "//internal/weave:__subpackages__",
diff --git a/internal/platform/implementation/g3/platform.cc b/internal/platform/implementation/g3/platform.cc
index e4056d14..f8fc4fbb 100644
--- a/internal/platform/implementation/g3/platform.cc
+++ b/internal/platform/implementation/g3/platform.cc
@@ -32,6 +32,7 @@
 #include "internal/platform/implementation/condition_variable.h"
 #include "internal/platform/implementation/log_message.h"
 #include "internal/platform/implementation/mutex.h"
+#include "internal/platform/implementation/preferences_repository.h"
 #include "internal/platform/implementation/scheduled_executor.h"
 #include "internal/platform/implementation/server_sync.h"
 #include "internal/platform/implementation/shared/count_down_latch.h"
@@ -52,6 +53,7 @@
 #include "internal/platform/implementation/g3/log_message.h"
 #include "internal/platform/implementation/g3/multi_thread_executor.h"
 #include "internal/platform/implementation/g3/mutex.h"
+#include "internal/platform/implementation/g3/preferences_repository.h"
 #include "internal/platform/implementation/g3/scheduled_executor.h"
 #include "internal/platform/implementation/g3/single_thread_executor.h"
 #include "internal/platform/implementation/g3/timer.h"
@@ -235,5 +237,10 @@ ImplementationPlatform::CreateDeviceInfo() {
   return std::make_unique<g3::DeviceInfo>();
 }
 
+std::unique_ptr<nearby::api::PreferencesRepository>
+ImplementationPlatform::CreatePreferencesRepository(absl::string_view path) {
+  return std::make_unique<g3::PreferencesRepository>(path);
+}
+
 }  // namespace api
 }  // namespace nearby
diff --git a/internal/platform/implementation/platform.h b/internal/platform/implementation/platform.h
index 862bae8f..30d0d3d2 100644
--- a/internal/platform/implementation/platform.h
+++ b/internal/platform/implementation/platform.h
@@ -46,6 +46,7 @@
 #ifndef NO_WEBRTC
 #include "internal/platform/implementation/webrtc.h"
 #endif
+#include "internal/platform/implementation/preferences_repository.h"
 #include "internal/platform/implementation/wifi.h"
 #include "internal/platform/implementation/wifi_direct.h"
 #include "internal/platform/implementation/wifi_hotspot.h"
@@ -148,6 +149,9 @@ class ImplementationPlatform {
   //         return WebResponse if HTTP status code between 200 and 300.
   //         other cases will return absl Status in error.
   static absl::StatusOr<WebResponse> SendRequest(const WebRequest& request);
+
+  static std::unique_ptr<nearby::api::PreferencesRepository>
+  CreatePreferencesRepository(absl::string_view path);
 };
 
 }  // namespace api
diff --git a/internal/platform/implementation/windows/platform.cc b/internal/platform/implementation/windows/platform.cc
index 70047776..b7956fe8 100644
--- a/internal/platform/implementation/windows/platform.cc
+++ b/internal/platform/implementation/windows/platform.cc
@@ -53,6 +53,7 @@
 #include "internal/platform/implementation/windows/listenable_future.h"
 #include "internal/platform/implementation/windows/log_message.h"
 #include "internal/platform/implementation/windows/mutex.h"
+#include "internal/platform/implementation/windows/preferences_repository.h"
 #include "internal/platform/implementation/windows/scheduled_executor.h"
 #include "internal/platform/implementation/windows/server_sync.h"
 #include "internal/platform/implementation/windows/settable_future.h"
@@ -141,7 +142,7 @@ std::string ImplementationPlatform::GetAppDataPath(
       FOLDERID_LocalAppData,  //  rfid: A reference to the KNOWNFOLDERID that
                               //  identifies the folder.
       0,           // dwFlags: Flags that specify special retrieval options.
-      NULL,        // hToken: An access token that represents a particular user.
+      nullptr,     // hToken: An access token that represents a particular user.
       &basePath);  // ppszPath: When this method returns, contains the address
                    // of a pointer to a null-terminated Unicode string that
                    // specifies the path of the known folder. The calling
@@ -149,7 +150,7 @@ std::string ImplementationPlatform::GetAppDataPath(
                    // is no longer needed by calling CoTaskMemFree, whether
                    // SHGetKnownFolderPath succeeds or not.
   size_t bufferSize;
-  wcstombs_s(&bufferSize, NULL, 0, basePath, 0);
+  wcstombs_s(&bufferSize, nullptr, 0, basePath, 0);
   std::string fullpathUTF8(bufferSize - 1, '\0');
   wcstombs_s(&bufferSize, fullpathUTF8.data(), bufferSize, basePath, _TRUNCATE);
   CoTaskMemFree(basePath);
@@ -320,5 +321,10 @@ std::unique_ptr<DeviceInfo> ImplementationPlatform::CreateDeviceInfo() {
   return std::make_unique<windows::DeviceInfo>();
 }
 
+std::unique_ptr<nearby::api::PreferencesRepository>
+ImplementationPlatform::CreatePreferencesRepository(absl::string_view path) {
+  return std::make_unique<windows::PreferencesRepository>(path);
+}
+
 }  // namespace api
 }  // namespace nearby
diff --git a/internal/platform/listeners.h b/internal/platform/listeners.h
index e4ef54bd..f1143a13 100644
--- a/internal/platform/listeners.h
+++ b/internal/platform/listeners.h
@@ -27,6 +27,11 @@ constexpr absl::AnyInvocable<void(Args...)> DefaultCallback() {
   return absl::AnyInvocable<void(Args...)>{[](Args...) {}};
 }
 
+template <typename... Args>
+constexpr std::function<void(Args...)> DefaultFuncCallback() {
+  return [](Args...) {};
+}
+
 }  // namespace nearby
 
 #endif  // PLATFORM_BASE_LISTENERS_H_