Dropbox Webhook for Business

Just install dropbox-psd-python (https://github.com/dropbox/dropbox-sdk-python). Business App integration process was ok. When I add file to my Dropbox Business

{    
    u'list_folder': {        
        u'teams': {            
            u'dbtid:AAB***': [                
                u'dbmid:AAA******',
                u'dbmid:AAC******'
            ]
        }
    },    
    u'delta': {        
        u'teams': {            
            u'dbtid:AAB***': [
                u'dbmid:AAA******',
                u'dbmid:AAC******'
            ]
        }
    }
}

Now I want to call delta to get what exactly change with my dropbox, as I did it before

client = dropbox.dropbox.DropboxTeam(token)
client.delta(cursor)

But there is not delta function call in last version? And I could not find anything substitute of delta How can I do it?

Thanks.