Laravel\Cashier\Subscription::cancel PHP Method

    public function cancel()
    {
        $subscription = $this->asBraintreeSubscription();
        if ($this->onTrial()) {
            BraintreeSubscription::cancel($subscription->id);
            $this->markAsCancelled();
        } else {
            BraintreeSubscription::update($subscription->id, ['numberOfBillingCycles' => $subscription->currentBillingCycle]);
            $this->ends_at = $subscription->billingPeriodEndDate;
            $this->save();
        }
        return $this;
    }