Stripe Checkout with Laravel Cashier

use Stripe\Checkout\Session as CheckoutSession;

public function checkout(User $user)
{
    return with($request->user(), function ($user) use ($request) {
        return with(CheckoutSession::create(array_merge($user->stripe_id ? ['customer' => $user->stripe_id] : ['customer_email' => $user->email], [
            'payment_method_types'        => ['card'],
            'subscription_data' => [
                'items'             => [['plan' => 'PLAN_ID_HERE']],
                'trial_period_days' => 7,
            ],
            'allow_promotion_codes' => true,
            'mode'                  => 'subscription',
            'client_reference_id'   => $user->id,
            'success_url'           => url('/home'),
            'cancel_url'            => URL::previous(url('/register')),
        ])), fn ($session) => $session->id);
    });
}

use Illuminate\Support\Facades\DB;
use Laravel\Cashier\Http\Controllers\WebhookController as CashierController;

class StripeWebhookController extends CashierController
{
    public function handleCheckoutSessionCompleted(array $payload)
    {
        $session = $payload['data']['object'];
        $user = User::findOrFail($session['client_reference_id']);

        DB::transaction(function () use ($session, $user) {
            $user->update(['stripe_id' => $session['customer']]);

            $user->subscriptions()->create([
                'name'          => 'default',
                'stripe_id'     => $session['subscription'],
                'stripe_status' => 'trialing' // Or use "active" if you don't provide a trial
                'stripe_plan'   => 'PLAN_ID_HERE',
                'quantity'      => 1,
                'trial_ends_at' => now()->addDays(7),
                'ends_at'       => null,
            ]);
        });

        return $this->successMethod();
    }
}