How to handle subscriptions with sepa_debit and trial with laravel cashier

So I need to include a payment method and i'm struggling to find a way to include subscriptions with trial and sepa_debit with laravel cashier. I was kinda able to do it with stripe directly but without a trial, but i won't get it how to do it with cashier and stripe elements.

I currently have 3 endpoints:

/** Show the available prices and create or get the stripe customer */
    public function showPrices()
    {
        $customer = \Auth::user()->createOrGetStripeCustomer();

        $prices = $this->stripe->prices->all();

        return view('central.payment.start', compact('customer', 'prices', 'intent'));
    }

/** After click on the price, the user is redirectet to this endpoint */
    public function startSubscription()
    {
        $intent = \Auth::user()->createSetupIntent([
            'payment_method_types' => ['sepa_debit', 'card'],
        ]);

       /* $subscription = \Auth::user()->newSubscription('test', request()->priceId)
                        ->trialDays(5)
                        ;*/
       /*  $subscription = $this->stripe->subscriptions->create([
            'customer' => \request()->customerId,
            'items' => [[
                'price' => request()->priceId
            ]],
           # 'trial_period_days' => '10',
            'payment_behavior' => 'allow_incomplete',
            'expand' => ['latest_invoice.payment_intent', 'pending_setup_intent']
        ]);
*/
        $subscription = null;
         $clientSecret = $intent->client_secret; //$subscription->pending_setup_intent->client_secret;

        return view('central.payment.subscription', compact('subscription', 'intent', 'clientSecret'));
    }

/*  Here i receive a stripe key starting with 'seti_..... '*/
    public function subscribed(Request $request)
    {
        dd($request->all());
    }

I use this code to show the elements form

<form id="payment-form" >
    <div id="payment-element">
        <!-- Elements will create form elements here -->
    </div>
    <button id="submit">Subscribe</button>
    <div id="error-message">
        <!-- Display error message to your customers here -->
    </div>
</form>

<script>
    const stripe = Stripe('{{ config('cashier.key') }}');

    const options = {
        clientSecret: '{{ $clientSecret }}',
        // Fully customizable with appearance API.
        appearance: {/*...*/},
    };

    // Set up Stripe.js and Elements to use in checkout form, passing the client secret obtained in step 5
    const elements = stripe.elements(options);

    // Create and mount the Payment Element
    const paymentElement = elements.create('payment');
    paymentElement.mount('#payment-element');

    const form = document.getElementById('payment-form');

    form.addEventListener('submit', async (event) => {
        event.preventDefault();

        console.log(elements);

        const { error} = await stripe.confirmSetup({
            //`Elements` instance that was used to create the Payment Element
            elements,
            confirmParams: {
                return_url: '{{ route('payment.status.returnUrl') }}',
            }
        });

        console.log(error)

        if (error) {
            // This point will only be reached if there is an immediate error when
            // confirming the payment. Show error to your customer (e.g., payment
            // details incomplete)
            const messageContainer = document.querySelector('#error-message');
            messageContainer.textContent = error.message;
        } else {
            // Your customer will be redirected to your `return_url`. For some payment
            // methods like iDEAL, your customer will be redirected to an intermediate
            // site first to authorize the payment, then redirected to the `return_url`.
        }
    });

</script>

So my flow currently is:

-> Create or retrieve the current customer

-> Get all available prices

-> User clicks on price -> Form submits

-> A setup intent is created with sepa_debit and card as payment subscription options

-> Show the Stripe elements form

-> I type in the stripe test card number

-> Gets redirected to the returnUrl which in my case calls subscribed. But here I receive two tokens: A setup_intent and a setup_intent_client_secret

What am I supposed to do with those? Where should I create the subscription? After a week of trial and error am confused as hell and I have no clue what I'm doing wrong. Every tutorial I find only includes card payments.

Thanks for any help and hints in advance!