public function cards($parameters = [])
    {
        $cards = [];

        $parameters = array_merge(['limit' => 24], $parameters);

        $stripeCards = $this->asStripeCustomer()->sources->all(
            ['object' => 'card'] + $parameters
        );

        if (! is_null($stripeCards)) {
            foreach ($stripeCards->data as $card) {
                $cards[] = new Card($this, $card);
            }
        }

        return new Collection($cards);
    }