Stripe Cashier form is not submitted - laravel

Question

I have a problem with stripe cashier; i get
This customer has no attached payment source
I don't know why, hope someone could help me... many thanks in advance.
I tried to look a lot of tutorials but i can't get any good results.
Maybe it's a problem with the token ? i tried to enter the credit card test :
4242 4242 4242 4242
I would like to use it as a subscription.
Here my view
<div class="container">
<div class="row">
<script src="https://js.stripe.com/v3/"></script>
<form action="{{route('checkout')}}" method="post" id="payment-form">
{{csrf_field()}}
<div class="form-row">
<label for="card-element">
Credit or debit card
</label>
<div id="card-element">
<!-- a Stripe Element will be inserted here. -->
</div>
<!-- Used to display form errors -->
<div id="card-errors" role="alert"></div>
</div>
<button>Submit Payment</button>
</form>
</div>
</div>
</div>
<script>
// Create a Stripe client
var stripe = Stripe('.....');
// Create an instance of Elements
var elements = stripe.elements();
// Custom styling can be passed to options when creating an Element.
// (Note that this demo uses a wider set of styles than the guide below.)
var style = {
base: {
color: '#32325d',
lineHeight: '18px',
fontFamily: '"Helvetica Neue", Helvetica, sans-serif',
fontSmoothing: 'antialiased',
fontSize: '16px',
'::placeholder': {
color: '#aab7c4'
}
},
invalid: {
color: '#fa755a',
iconColor: '#fa755a'
}
};
// Create an instance of the card Element
var card = elements.create('card', {style: style});
// Add an instance of the card Element into the `card-element` <div>
card.mount('#card-element');
// Handle real-time validation errors from the card Element.
card.addEventListener('change', function(event) {
var displayError = document.getElementById('card-errors');
if (event.error) {
displayError.textContent = event.error.message;
} else {
displayError.textContent = '';
}
});
// Handle form submission
var form = document.getElementById('payment-form');
form.addEventListener('submit', function(event) {
event.preventDefault();
stripe.createToken(card).then(function(result) {
if (result.error) {
// Inform the user if there was an error
var errorElement = document.getElementById('card-errors');
errorElement.textContent = result.error.message;
} else {
// Send the token to your server
stripeTokenHandler(result.token);
}
});
});
</script>
Here my checkout controller :
public function checkout(Request $request)
{
try {
Stripe::setApiKey('.....');
$user = User::find(1);
$user->newSubscription('main', 'monthly')->create($request->stripeToken);
return 'Subscription successful, you get the course!';
} catch (\Exception $ex) {
return $ex->getMessage();
}
}