Laravel Cashier optimized for 3D Secure cards

ManagesPaymentMethods.php

//Add these lines to Cashier's Concerns/ManagesPaymentMethods.php

use Stripe\PaymentIntent as StripePaymentIntent;

...


public function createPaymentIntent(array $options = [])
{
    return StripePaymentIntent::create(
        $options, $this->stripeOptions()
    );
}

subscription.js

cardButton.addEventListener('click', function(ev) {
    ev.preventDefault();
    ev.stopPropagation();
    if(validate_payment_form()) {
        disable_form();
        stripe.confirmCardPayment(clientSecret, {
                payment_method: {
                    card: cardElement,
                    billing_details: {
                        name: cardholderName.value,
                        email: cardholderEmail.value
                    },
                }
            }
        ).then(function(result) {
            if(result.error) {
                enable_form();
                if(result.error.message) {
                    $('#card-element').addClass("is-invalid");
                    $('#card-error').text(result.error.message);
                }						
            } else { //success
                enable_form();
                $('#intent').val(result.paymentIntent.payment_method);
                container.submit();
                disable_form();
            }
        });
    }
});

SubscriptionController.php

public function startPurchase()
{
	$user = auth()->user();

	$stripeCustomer = $user->createOrGetStripeCustomer();
	$intent = $user->createPaymentIntent([
		'amount' => 1000,
		'currency' => 'usd',
		'customer' => $stripeCustomer->id,
		'setup_future_usage' => 'off_session'
	]);

	return view('subscription.purchase',compact("intent"));
}

public function finishPurchase(Request $request)
{
    $user = auth()->user();

    ...set $plan_id...

    try {
        $ret = $user->newSubscription('default', $plan_id)->trialDays(30)->create($data['intent']);
    } catch(IncompletePayment $e) {
        return redirect()->route(
            'cashier.payment',
            [$e->payment->id, 'redirect' => route('subscription.success')]
        );
    } catch(PaymentFailure $e) {
        return redirect()->back()->withErrors([$e->getMessage()]);
    }
    return view('subscription.success');
}