public function newSubscription(string $subscription, string $plan): SubscriptionBuilder
    {
        return new SubscriptionBuilder($this, $subscription, $plan);
    }
public function newSubscription(string $subscription, string $plan): SubscriptionBuilder
    {
        return new SubscriptionBuilder($this, $subscription, $plan);
    }
public function newSubscription ( string $ subscription , string $ plan ) : SubscriptionBuilder { return new SubscriptionBuilder ( $ this , $ subscription , $ plan ) ; }
Begin creating a new subscription.

@param string $subscription
@param string $plan

@return SubscriptionBuilder
Begin creating a new subscription .