FAAREN Subscription error

create-subscription.php

Stripe::setApiKey(config('services.stripe.secret'));
        $subscription = $this->getSubscription(); // This is the subscription from our database

        $customer = Customer::retrieve($subscription->consumer->stripe_id);

        //dd($customer);

        $plan = Plan::create([
            'amount'    => $subscription->price * 100,
            'interval'  => 'month',
            'product'   => $subscription->vehicle->stripe_id,
            'currency'  => 'eur',
            'billing_scheme' => 'per_unit'
        ]);

        $stripeSubscription = \Stripe\Subscription::create([
            //'customer'  => $subscription->consumer->stripe_id,
            'customer'  => $customer,
            'application_fee_percent'   => ($subscription->bookedMonth->faaren_surcharge - 1) * 100,
            'billing'   => 'charge_automatically',
            'tax_percent'   => 0,
            'items' => [
                ['plan' => $plan->id]
            ]
        ],  ["stripe_account" => $subscription->producer->stripe_id]);