Full documentation can be found here
Here is a Sample of the "Append" api
} "username": "[username]", "passtoken": "[passtoken]", "action": "append", "templateId": "[template_id]", "csvData": "False", "data": { "id": "[id]", "name": "[name]", "mobile": "[mobile]", "phone": "[phone]", "email": "[email]" } }