Note:

• To use this API, an OAuth token should be generated with the following scopes; ZohoWriter.documentEditor.ALL and ZohoWriter.merge.ALL 
• To use this API for CRM and People templates you need to add the following scopes and include the id in the merge_data

CRM: ZohoCRM.settings.emails.ALL 

People: zohopeople.automation.ALL 

Sample merge data: merge_data = {data: [{"name": "Amelia", "email": "amelia@zylker.com", "id": "1234567789"}]}

• To use the 'from address alias' of Zoho Mail service as 'from address' for this API, you need to include VirtualOffice.settings.ALL scope as well.
• You can also send the merged documents via email using the deluge task, followed by the parameters zoho.writer.mergeAndSend(.....)