public function subscribedToPlan($plans, $subscription = 'default')
    {
        $subscription = $this->subscription($subscription);

        if (! $subscription || ! $subscription->valid()) {
            return false;
        }

        foreach ((array) $plans as $plan) {
            if ($subscription->braintree_plan === $plan) {
                return true;
            }
        }

        return false;
    }