docs: def create(self, **kwargs):
          """
          returns the JSON object
          {'embedded': {
            'sign_url': 'https://www.hellosign.com/editor/embeddedSign?signature_id={signature_id}&token={token}',
            'expires_at': {timestamp}
          }}        
          """
          auth = None
          if 'auth' in kwargs:
              auth = kwargs['auth']
              del(kwargs['auth'])
  
          self._url = '%s%s%s' % (self.base_uri, 'embedded/sign_url/', self.signature_id)
  
          return self.embedded.sign_url.get(auth=auth, **kwargs)