async def unban_chat_member(self, chat_id: typing.Union[base.Integer, base.String],
                                user_id: base.Integer) -> base.Boolean:
        """
        Use this method to unban a previously kicked user in a supergroup or channel. `
        The user will not return to the group or channel automatically, but will be able to join via link, etc.

        The bot must be an administrator for this to work.

        Source: https://core.telegram.org/bots/api#unbanchatmember

        :param chat_id: Unique identifier for the target group or username of the target supergroup or channel
        :type chat_id: :obj:`typing.Union[base.Integer, base.String]`
        :param user_id: Unique identifier of the target user
        :type user_id: :obj:`base.Integer`
        :return: Returns True on success
        :rtype: :obj:`base.Boolean`
        """
        payload = generate_payload(**locals())

        result = await self.request(api.Methods.UNBAN_CHAT_MEMBER, payload)
        return result
Use this method to unban a previously kicked user in a supergroup or channel. `
        The user will not return to the group or channel automatically, but will be able to join via link, etc.

        The bot must be an administrator for this to work.

        Source: https://core.telegram.org/bots/api#unbanchatmember

        :param chat_id: Unique identifier for the target group or username of the target supergroup or channel
        :type chat_id: :obj:`typing.Union[base.Integer, base.String]`
        :param user_id: Unique identifier of the target user
        :type user_id: :obj:`base.Integer`
        :return: Returns True on success
        :rtype: :obj:`base.Boolean`