def purchase_vlan(self, vlan_name, debug=False):
        """
        Purchase a new VLAN.
        :param debug: Log the json response if True
        :param vlan_name: String representing the name of the vlan (virtual switch)
        :return: a Vlan Object representing the vlan created
        """
        vlan_name = {'VLanName': vlan_name}
        json_scheme = self.gen_def_json_scheme('SetPurchaseVLan', vlan_name)
        json_obj = self.call_method_post(method="SetPurchaseVLan", json_scheme=json_scheme)
        if debug is True:
            self.logger.debug(json_obj)
        if json_obj['Success'] is False:
            raise Exception("Cannot purchase new vlan.")
        vlan = Vlan()
        vlan.name = json_obj['Value']['Name']
        vlan.resource_id = json_obj['Value']['ResourceId']
        vlan.vlan_code = json_obj['Value']['VlanCode']
        return vlan
Purchase a new VLAN.
        :param debug: Log the json response if True
        :param vlan_name: String representing the name of the vlan (virtual switch)
        :return: a Vlan Object representing the vlan created