How to display Mollie order status in the redirecturl?

The redirectURL does not seem to POST any data back. It seems to use a GET request. How do I know the payment ID or payment status on the return URL?

$payment = \mollie::api()->payments()->create([
    'amount'        => $price,
    'customerId'    => $customer->id,
    'description'   => 'My Initial Payment',
    'redirectUrl'   => \URL::to('/after-payment'),
]);

via Z0q