def save(self):  # pylint: disable=arguments-differ
        """
        Save the EnterpriseCustomerUser.
        """
        enterprise_customer = self.validated_data['enterprise_customer']

        ecu = models.EnterpriseCustomerUser(
            user_id=self.user.pk,
            enterprise_customer=enterprise_customer,
        )
        ecu.save()
Save the EnterpriseCustomerUser.