Can some one point me the steps to do the following for a Potential(Lead) ?

1. We have a quotation generation system. We get the Leads data from Zoho CRM and dumped the data to our won system.

2. We do generate quotes against that lead.

3. Now Once the leads are converted to Quote. I want to updated the lead status back from our system to Zoho CRM that it is closed. What is the simplest way of doing it? Only thing I want to do now, is the status update. I do not want to update any invoice, product information etc.

4. For pulling all data we have done JSON parsing. So what is the api and format I should use for lead status updated.

Thanks in advance.

Uttanka