'Create a new ServiceInstance
:param unicode friendly_name: A human readable description of this resource
:param bool auto_create: Boolean flag specifying whether to auto-create threads.
:param unicode callback_url: URL Twilio will request for callbacks.
:returns: Newly created ServiceInstance
:rtype: twilio.rest.preview.proxy.service.ServiceInstance'

def create(self, friendly_name=values.unset, auto_create=values.unset, callback_url=values.unset):

    data = values.of({'FriendlyName': friendly_name, 'AutoCreate': auto_create, 'CallbackUrl': callback_url})
    payload = self._version.create('POST', self._uri, data=data)
    return ServiceInstance(self._version, payload)
