public function getWebhookUrls(string $key = null)
    {
        return $key
            ? $this->webhookUrls[$key] ?? null
            : $this->webhookUrls;
    }
public function getWebhookUrls(string $key = null)
    {
        return $key
            ? $this->webhookUrls[$key] ?? null
            : $this->webhookUrls;
    }
public function getWebhookUrls ( string $ key = null ) { return $ key ? $ this -> webhookUrls [ $ key ] ?? null : $ this -> webhookUrls ; }
Get the Webhook URLs

@param string|null $key
@return array|string
Get the Webhook URLs