public function sendGetServicePricing($lg, $lc)
    {
        $msgId = $this->createIqId();
        $pricingNode = new ProtocolNode('pricing',
            [
                'lg' => $lg,
                'lc' => $lc,
            ], null, null);
        $node = new ProtocolNode('iq',
            [
                'id'    => $msgId,
                'xmlns' => 'urn:xmpp:whatsapp:account',
                'type'  => 'get',
                'to'    => Constants::WHATSAPP_SERVER,
            ], [$pricingNode], null);

        $this->sendNode($node);
    }