问Laravel收银机(Stripe)收取订阅费用或使用优惠券？

EN

<?php

namespace App\Traits;

use Carbon\Carbon;

trait Coupon 
{
    public function getSubscriptions()
    {
        return $this->asStripeCustomer()->subscriptions->data;
    }

    public function getSubscription()
    {
        foreach ($this->getSubscriptions() as $subscription) {
            if ($subscription->status === 'active') {
                return $subscription;
            }
        }
    }

    public function discount()
    {
        return $this->getSubscription()->discount;
    }

    public function discountCustomerId()
    {
        return $this->discount()->customer;
    }

    public function discountSubscriptionId()
    {
        return $this->discount()->subscription;
    }

    public function discountStartDate()
    {
        return Carbon::createFromTimestamp($this->discount()->start);
    }

    public function discountEndDate()
    {
         return Carbon::createFromTimestamp($this->discount()->end);
    }

    public function discountDaysLeft()
    {
        return $this->discountEndDate()
            ->diffInDays($this->discountStartDate());
    }

    public function coupon()
    {
        return $this->discount()->coupon;
    }

    public function couponIsValid()
    {
         return $this->coupon()->valid;
    }
}