diff --git a/storage/app_store.hpp b/storage/app_store.hpp
new file mode 100644
index 0000000000..ca3e3a7f17
--- /dev/null
+++ b/storage/app_store.hpp
@@ -0,0 +1,19 @@
+#pragma once
+
+#include "../std/stdint.hpp"
+
+struct HttpFinishedParams;
+
+namespace appstore
+{
+  class Client
+  {
+    /// @name HTTP callbacks
+    //@{
+    void OnVersionCheck(HttpFinishedParams const & params);
+    //@}
+
+  public:
+    void RequestVersionCheck(int64_t countriesVersion, int64_t purchasesVersion);
+  };
+}