Changing Order Status Triggering Separate Leads and Contact

Hi Team, I wanted to under the integration with Zoho CRM, my issue is the when the order comes in it is at processing stage so should stay in leads or contacts but when it is completed it should be in deals or contacts instead of leads but the action is duplication the details, can the same lead be converted to contacts when we complete the order.

The page I need help with: [log in to see the link]