public function registerCard(string $customerId, string $urlReturn = null)
    {
        $this->flow->getLogger()->debug("Registering Card for $customerId, returns to $urlReturn");

        return BasicResponse::make(
            $this->flow->send('post',
                $this->endpoint . '/register',
                [
                    'customerId' => $customerId,
                    'url_return' => $urlReturn ?? $this->flow->getReturnUrls('card.url_return'),
                ]
            )
        );
    }