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docs2/dispatcher/class_based_handlers/pre_checkout_query.rst

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+=======================
+PreCheckoutQueryHandler
+=======================
+
+There is base class for callback query handlers.
+
+Simple usage
+============
+
+.. code-block:: python
+
+    from aiogram.handlers import PreCheckoutQueryHandler
+
+    ...
+
+    @router.pre_checkout_query()
+    class MyHandler(PreCheckoutQueryHandler):
+        async def handle(self) -> Any: ...
+
+Extension
+=========
+
+This base handler is subclass of :ref:`BaseHandler <cbh-base-handler>` with some extensions:
+
+- :code:`self.from_user` is alias for :code:`self.event.from_user`