def METHOD_NAME(self):
    if not self.pk:
        raise ValueError("Instance must have a PK")
    self.api_key = rewrap(self.api_key, field="api_key", model="wsone.instance", pk=self.pk)
    self.client_secret = rewrap(self.client_secret, field="client_secret", model="wsone.instance", pk=self.pk)
    self.password = rewrap(self.password, field="password", model="wsone.instance", pk=self.pk)