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Name	Action
..
Billable.php	Edit
Card.php	Edit
Cashier.php	Edit
CashierServiceProvider.php	Edit
Http
Invoice.php	Edit
InvoiceItem.php	Edit
Subscription.php	Edit
SubscriptionBuilder.php	Edit

Editing: Subscription.php

<?php

namespace Laravel\Cashier;

use Carbon\Carbon;
use LogicException;
use DateTimeInterface;
use Illuminate\Database\Eloquent\Model;

class Subscription extends Model
{
    /**
     * The attributes that are not mass assignable.
     *
     * @var array
     */
    protected $guarded = [];

/**
     * The attributes that should be mutated to dates.
     *
     * @var array
     */
    protected $dates = [
        'trial_ends_at', 'ends_at',
        'created_at', 'updated_at',
    ];

/**
     * Indicates if the plan change should be prorated.
     *
     * @var bool
     */
    protected $prorate = true;

/**
     * The date on which the billing cycle should be anchored.
     *
     * @var string|null
     */
    protected $billingCycleAnchor = null;

/**
     * Get the user that owns the subscription.
     *
     * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
     */
    public function user()
    {
        return $this->owner();
    }

/**
     * Get the model related to the subscription.
     *
     * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
     */
    public function owner()
    {
        $class = Cashier::stripeModel();

return $this->belongsTo($class, (new $class)->getForeignKey());
    }

/**
     * Determine if the subscription is active, on trial, or within its grace period.
     *
     * @return bool
     */
    public function valid()
    {
        return $this->active() || $this->onTrial() || $this->onGracePeriod();
    }

/**
     * Determine if the subscription is active.
     *
     * @return bool
     */
    public function active()
    {
        return is_null($this->ends_at) || $this->onGracePeriod();
    }

/**
     * Determine if the subscription is recurring and not on trial.
     *
     * @return bool
     */
    public function recurring()
    {
        return ! $this->onTrial() && ! $this->cancelled();
    }

/**
     * Determine if the subscription is no longer active.
     *
     * @return bool
     */
    public function cancelled()
    {
        return ! is_null($this->ends_at);
    }

/**
     * Determine if the subscription has ended and the grace period has expired.
     *
     * @return bool
     */
    public function ended()
    {
        return $this->cancelled() && ! $this->onGracePeriod();
    }

/**
     * Determine if the subscription is within its trial period.
     *
     * @return bool
     */
    public function onTrial()
    {
        return $this->trial_ends_at && $this->trial_ends_at->isFuture();
    }

/**
     * Determine if the subscription is within its grace period after cancellation.
     *
     * @return bool
     */
    public function onGracePeriod()
    {
        return $this->ends_at && $this->ends_at->isFuture();
    }

/**
     * Increment the quantity of the subscription.
     *
     * @param  int  $count
     * @return $this
     */
    public function incrementQuantity($count = 1)
    {
        $this->updateQuantity($this->quantity + $count);

return $this;
    }

/**
     *  Increment the quantity of the subscription, and invoice immediately.
     *
     * @param  int  $count
     * @return $this
     */
    public function incrementAndInvoice($count = 1)
    {
        $this->incrementQuantity($count);

$this->user->invoice();

return $this;
    }

/**
     * Decrement the quantity of the subscription.
     *
     * @param  int  $count
     * @return $this
     */
    public function decrementQuantity($count = 1)
    {
        $this->updateQuantity(max(1, $this->quantity - $count));

return $this;
    }

/**
     * Update the quantity of the subscription.
     *
     * @param  int  $quantity
     * @param  \Stripe\Customer|null  $customer
     * @return $this
     */
    public function updateQuantity($quantity, $customer = null)
    {
        $subscription = $this->asStripeSubscription();

$subscription->quantity = $quantity;

$subscription->prorate = $this->prorate;

$subscription->save();

$this->quantity = $quantity;

$this->save();

return $this;
    }

/**
     * Indicate that the plan change should not be prorated.
     *
     * @return $this
     */
    public function noProrate()
    {
        $this->prorate = false;

return $this;
    }

/**
     * Change the billing cycle anchor on a plan change.
     *
     * @param  \DateTimeInterface|int|string  $date
     * @return $this
     */
    public function anchorBillingCycleOn($date = 'now')
    {
        if ($date instanceof DateTimeInterface) {
            $date = $date->getTimestamp();
        }

$this->billingCycleAnchor = $date;

return $this;
    }

/**
     * Force the trial to end immediately.
     *
     * This method must be combined with swap, resume, etc.
     *
     * @return $this
     */
    public function skipTrial()
    {
        $this->trial_ends_at = null;

return $this;
    }

/**
     * Swap the subscription to a new Stripe plan.
     *
     * @param  string  $plan
     * @return $this
     */
    public function swap($plan)
    {
        $subscription = $this->asStripeSubscription();

$subscription->plan = $plan;

$subscription->prorate = $this->prorate;

if (! is_null($this->billingCycleAnchor)) {
            $subscription->billing_cycle_anchor = $this->billingCycleAnchor;
        }

// If no specific trial end date has been set, the default behavior should be
        // to maintain the current trial state, whether that is "active" or to run
        // the swap out with the exact number of days left on this current plan.
        if ($this->onTrial()) {
            $subscription->trial_end = $this->trial_ends_at->getTimestamp();
        } else {
            $subscription->trial_end = 'now';
        }

// Again, if no explicit quantity was set, the default behaviors should be to
        // maintain the current quantity onto the new plan. This is a sensible one
        // that should be the expected behavior for most developers with Stripe.
        if ($this->quantity) {
            $subscription->quantity = $this->quantity;
        }

$subscription->save();

$this->user->invoice();

$this->fill([
            'stripe_plan' => $plan,
            'ends_at' => null,
        ])->save();

return $this;
    }

/**
     * Cancel the subscription at the end of the billing period.
     *
     * @return $this
     */
    public function cancel()
    {
        $subscription = $this->asStripeSubscription();

$subscription->cancel(['at_period_end' => true]);

// If the user was on trial, we will set the grace period to end when the trial
        // would have ended. Otherwise, we'll retrieve the end of the billing period
        // period and make that the end of the grace period for this current user.
        if ($this->onTrial()) {
            $this->ends_at = $this->trial_ends_at;
        } else {
            $this->ends_at = Carbon::createFromTimestamp(
                $subscription->current_period_end
            );
        }

$this->save();

return $this;
    }

/**
     * Cancel the subscription immediately.
     *
     * @return $this
     */
    public function cancelNow()
    {
        $subscription = $this->asStripeSubscription();

$subscription->cancel();

$this->markAsCancelled();

return $this;
    }

/**
     * Mark the subscription as cancelled.
     *
     * @return void
     */
    public function markAsCancelled()
    {
        $this->fill(['ends_at' => Carbon::now()])->save();
    }

/**
     * Resume the cancelled subscription.
     *
     * @return $this
     *
     * @throws \LogicException
     */
    public function resume()
    {
        if (! $this->onGracePeriod()) {
            throw new LogicException('Unable to resume subscription that is not within grace period.');
        }

$subscription = $this->asStripeSubscription();
        
        $subscription->cancel_at_period_end = false;

// To resume the subscription we need to set the plan parameter on the Stripe
        // subscription object. This will force Stripe to resume this subscription
        // where we left off. Then, we'll set the proper trial ending timestamp.
        $subscription->plan = $this->stripe_plan;

if ($this->onTrial()) {
            $subscription->trial_end = $this->trial_ends_at->getTimestamp();
        } else {
            $subscription->trial_end = 'now';
        }

$subscription->save();

// Finally, we will remove the ending timestamp from the user's record in the
        // local database to indicate that the subscription is active again and is
        // no longer "cancelled". Then we will save this record in the database.
        $this->fill(['ends_at' => null])->save();

return $this;
    }

/**
     * Get the subscription as a Stripe subscription object.
     *
     * @return \Stripe\Subscription
     *
     * @throws \LogicException
     */
    public function asStripeSubscription()
    {
        $subscriptions = $this->user->asStripeCustomer()->subscriptions;

if (! $subscriptions) {
            throw new LogicException('The Stripe customer does not have any subscriptions.');
        }

return $subscriptions->retrieve($this->stripe_id);
    }
}