Do you have plan to make the same integration like zoho invoice or zoho crm but with zoho support ?

Zoho Support does not support business logic for each field of the request form ( on user input or on update).  It would be helpful to create widget in the customer portal home page of Zoho Support with Zoho Creator  (same as using zoho creator inside zoho crm).

Otherwise, another idea, be able to schedule a script in zoho creator to retrieve all close tickets of the last week inside zoho support in order to bill the customers with zoho invoice (based on the category of their requests).