Unsubscribe, delete the relationship of the customer with the plan.

        Args:
            subscription_id: Identification of the subscription.

        Returns:

def delete_subscription(self, subscription_id):
        """
        Unsubscribe, delete the relationship of the customer with the plan.

        Args:
            subscription_id: Identification of the subscription.

        Returns:

        """
        return self.client._delete(self.url + 'subscriptions/{}'.format(subscription_id), headers=self.get_headers())