send php smart

$url = 'invoice';
            $data_send = array();
            $data_send['companyVatCode'] = $this->companyVatCode;
            $data_send['issueDate'] = date('Y-m-d');
            $data_send['seriesName'] = 'RO-SRV';

            $amount = number_format((int)$order['amount'] / 1.21, 2);

            if ($user_info['judet'] == 'Bucureşti'){
                $sector = ', '.$user_info['sector'];
            } else {
                $sector = '';
            }
            if ($user_info['legal'] == 1) {
                $data_send['client'] = array(
                    'name' => transliteration_text($user_info['companiei']),
                    "vatCode" => $user_info['CUI'],
                    'address' => transliteration_text($user_info['address']),
                    'email' => $user_info['email'],
                    'country' => "Romania",
                    'county' => transliteration_text($user_info['judet']),
                    'city' => transliteration_text($user_info['city']),
                    'phone' => $user_info['phone'],
                    "isTaxPayer" => true
                );
            } else {
                $data_send['client'] = array(
                    'name' => transliteration_text($user_info['name']),
                    'email' => $user_info['email'],
                    'address' => transliteration_text($user_info['address']),
                    'country' => "Romania",
                    'county' => transliteration_text($user_info['judet']),
                    'city' => transliteration_text($user_info['city']),
                    'phone' => $user_info['phone'],
                    'vatCode' => "-",
                    "isTaxPayer" => false
                );

            }

            $data_send['products'][] = array(
                "name" => 'Plata pentru serviciile de acces la stații de alimentare a bateriilor  vehiculelor electrice',
                "code" => 1,
                "measuringUnitName" => "buc",
                "currency" => "RON",
                "quantity" => 1,
                "price" => $amount,
                "taxPercentage" => 21
            );

            $json_send = json_encode($data_send);

            $response = $this->curl_init($url, 'POST', $json_send);