-slack-request-timestamp`, and its body data.

    Refer to https://api.slack.com/authentication/verifying-requests-from-slack for details.
    &#34;&#34;&#34;

    async def async_process(
        self,
        *,
        req: AsyncBoltRequest,
        resp: BoltResponse,
        # As this method is not supposed to be invoked by bolt-python users,
        # the naming conflict with the built-in one affects
        # only the internals of this method
        next: Callable[[], Awaitable[BoltResponse]],
    