Laravel Spark 403 - REDIRECT HOST MISMATCH when 3D Secure Payment

I am using Laravel Spark for billing my customers. In case they will pay with 3D Secure cards (I test it with card no. from stripe doc's https://stripe.com/docs/testing#regulatory-cards: 4000 0027 6000 3184) I have the following problem:

The stripe pop-up/modal opens and I click 'Complete Authentication'.

After that the authentication process starts and the user gets directed to http://127.0.0.1:8000/stripe/payment/pi_xxx?redirect=/home

Here I get the following Laravel error (I do not find other error causes in console or somewhere else):

I've added stripe/* in VerifyCsrfToken Class already... Maybe do I need to test this case on my server?

Very weird and I guess thats a sign that I do not have any issues with stripe, with laravel instead. When I remove the query parameter ?redirect=home I get this screen:

When I proceed I do not get redirected.. Of course because there is no redirect uri...

Does any one had this issue before?

For me this is a bug in Spark. I've searched for all occurences where Stripe used a redirect. One indication for me that this could really be a bug is:

In subscription-notice.blade.php file there ist the link build as follows:

{!! __('Please :linkOpen confirm your payment :linkClose to activate your subscription!', ['linkOpen' => '<a href="/'.config('cashier.path').'/payment/'.auth()->user()->subscription()->latestPayment()->id.'?redirect='.url('/home').'">', 'linkClose' => '</a>']) !!}

The part '?redirect='.url('/home').' creates a full valid URL with host address. Not only a relative path! These relative paths runs into the 403 Error in my case. Like in the RegisterController:

/**
 * Handle a registration request for the application.
 *
 * @param  \Laravel\Spark\Contracts\Http\Requests\Auth\RegisterRequest  $request
 * @return \Illuminate\Http\Response
 */
public function register(RegisterRequest $request)
{
    list($user, $paymentId) = Spark::interact(
        Register::class, [$request]
    );

    Auth::login($user);

    event(new UserRegistered($user));

    if ($user instanceof MustVerifyEmail && ! $user->hasVerifiedEmail()) {
        $user->sendEmailVerificationNotification();
    }

    return response()->json([
        'redirect' => $paymentId ?
            '/'.config('cashier.path').'/payment/'.$paymentId.'?redirect='.$this->redirectPath()
            : $this->redirectPath(),
    ]);
}

$this->redirectPath() returns a relative path. I've changed this part into:

return response()->json([
        'redirect' => $paymentId ?
            '/'.config('cashier.path').'/payment/'.$paymentId.'?redirect='.config('app.url').$this->redirectPath()
            : $this->redirectPath(),
    ]);

In this case I took the host address from my config and put it in front of the relative path.

Just for better understanding, the returned URL above is used here (register-stripe.js):

    /*
     * After obtaining the Stripe token, send the registration to Spark.
     */
    sendRegistration(paymentMethod) {
        this.registerForm.stripe_payment_method = paymentMethod;

        Spark.post('/register', this.registerForm)
            .then(response => {
                window.location = response.redirect;
            });
    }

There are some more cases where I needed to override some JavaScript or PHP sources...

• register process (showed here)
• update process of payment information
• create subscription with existing account

I hope I could help others with that! If necessary I could also post the exact places where I've changed the redirect URL in the comments.