.chat.start()

This API can be used to initiate a chat automatically on the visitor's behalf, but this method can be invoked only from inside a JavaScript OnClick event handler.

Note: 

• It is mandatory to use the visitor.question() API and set the visitor question before initiating the chat. 
• If the name, email, and phone fields are marked as mandatory in your brand settings (Settings > Brands > Select your brand > Flow Controls > Online/Offline fields), ensure to set these required fields using visitor.name(), visitor.email(), and visitor.contactnumber() API. 
• Additionally, the .chat.department() API can be used to display the departments before the call is initiated.