Форум

public function testInfo($bitrix_product_id) {
        $bitrix_url = 'https://xxx.bitrix24.ru/rest/1/f8unxxxxxxxxxx/';
        // $api_method = 'catalog.product.offer.get';
        $api_method = 'catalog.product.offer.list';
        $data = [
            'filter' => ['id' => $bitrix_product_id, 'iblockId' => 14, 'productType' => 3],
            'select' => ['id', 'iblockId', 'name', 'quantity', 'xmlId']
        ];

        $curl = curl_init();
        curl_setopt($curl, CURLOPT_URL, $bitrix_url . $api_method);
        curl_setopt($curl, CURLOPT_POST, true);
        curl_setopt($curl, CURLOPT_POSTFIELDS, http_build_query($data));
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);

        $response = curl_exec($curl);
        curl_close($curl);

        $result = json_decode($response, true);

        print_r($result);

        if (isset($result['result']) && is_array($result['result'])) {
            return $result['result'];
        } else {
            throw new Exception('Ошибка получения торговых предложений: ' . json_encode($result));
        }
    }

[error] => 0 [error_description] => productType is not allowed for this catalog