async def send_offnetwork_invitation(<EOL>self, send_offnetwork_invitation_request<EOL>):
response = hangouts_pb2.SendOffnetworkInvitationResponse()<EOL>await self._pb_request('<STR_LIT>',<EOL>send_offnetwork_invitation_request,<EOL>response)<EOL>return response<EOL>
Send an email to invite a non-Google contact to Hangouts.