old_contents: 
  from notifications_python_client.base import BaseAPIClient
  from app.notify_client.models import User
  
  
  class InviteApiClient(BaseAPIClient):
      def __init__(self, base_url=None, client_id=None, secret=None):
          super(self.__class__, self).__init__(base_url=base_url or 'base_url',
                                               client_id=client_id or 'client_id',
                                               secret=secret or 'secret')
  
      def init_app(self, app):
          self.base_url = app.config['API_HOST_NAME']
          self.client_id = app.config['ADMIN_CLIENT_USER_NAME']
          self.secret = app.config['ADMIN_CLIENT_SECRET']
  
      def create_invite(self, invite_from_id, service_id, email_address, permissions):
          data = {
              'service': str(service_id),
              'email_address': email_address,
              'from_user': invite_from_id,
              'permissions': permissions
          }
          resp = self.post(url='/service/{}/invite'.format(service_id), data=data)
          return resp['data']
  
      def get_invites_for_service(self, service_id):
          endpoint = '/service/{}/invite'.format(service_id)
          resp = self.get(endpoint)
          return [User(data) for data in resp['data']]
  
      def cancel_invited_user(self, service_id, invited_user_id):
          data = {'status': 'cancelled'}
          resp = self.post(url='/service/{0}/invite/{1}'.format(service_id, invited_user_id),
                           data=data)
          return resp['data']
  
new_contents: 
  from notifications_python_client.base import BaseAPIClient
  from app.notify_client.models import User
  
  
  class InviteApiClient(BaseAPIClient):
      def __init__(self, base_url=None, client_id=None, secret=None):
          super(self.__class__, self).__init__(base_url=base_url or 'base_url',
                                               client_id=client_id or 'client_id',
                                               secret=secret or 'secret')
  
      def init_app(self, app):
          self.base_url = app.config['API_HOST_NAME']
          self.client_id = app.config['ADMIN_CLIENT_USER_NAME']
          self.secret = app.config['ADMIN_CLIENT_SECRET']
  
      def create_invite(self, invite_from_id, service_id, email_address, permissions):
          data = {
              'service': str(service_id),
              'email_address': email_address,
              'from_user': invite_from_id,
              'permissions': permissions
          }
          resp = self.post(url='/service/{}/invite'.format(service_id), data=data)
          return resp['data']
  
      def get_invites_for_service(self, service_id):
          endpoint = '/service/{}/invite'.format(service_id)
          resp = self.get(endpoint)
          return [User(data) for data in resp['data']]
  
      def cancel_invited_user(self, service_id, invited_user_id):
          data = {'status': 'cancelled'}
          self.post(url='/service/{0}/invite/{1}'.format(service_id, invited_user_id),
                    data=data)
  
subject: Change cancel_invited_user client to not return anything.