Hi Gayathri,
Glad you managed to implement a workaround.
To call the standard notification you should be able to fetch the renewal MailTypeEnumType by using:
mailType = new MailTypeEnumType(47);
Or use the integer method with 47 as parameter.
This enum type isn't listed in the API, but you can find it's code in the RefGuide. This is a dynamic enum so the JavaDoc will not list all of them unfortunately.
Regards,
Bogdan Toma