I have developed a module in my magento 2.2.6 for to create an API that can update the product price and quantity via product id . Please see my code below









namespace AdmNetsuitePQ\NetsuitePQ\Model;

use Magento\Framework\Exception\InputException;
use Magento\Framework\Exception\NoSuchEntityException;
use Magento\Framework\Webapi\Exception as HTTPExceptionCodes;
use Magento\Catalog\Api\ProductRepositoryInterface;
use Magento\Catalog\Model\ProductFactory;
use AdmNetsuitePQ\NetsuitePQ\Api\ProductUpdateInterface;

class ProductUpdate implements ProductUpdateInterface
     * @var ProductRepositoryInterface
    protected $productRepository;

    public function __construct(
        ProductRepositoryInterface $productRepository
    ) {
        $this->productRepository = $productRepository;

     * {@inheritdoc}
    public function update($productId, $price = null, $quantity = null)
        $productId = (int) $productId;
        $product = $this->productRepository->getById($productId);
        if (!$product->getId()) {
            throw new NoSuchEntityException(__('Product with ID %1 not found.', $productId));
        if ($price !== null && $price < 0) {
            throw new InputException(__('Price must be greater than or equal to 0.'));
        if ($quantity !== null && $quantity < 0) {
            throw new InputException(__('Quantity must be greater than or equal to 0.'));
        if ($price !== null) {
        if ($quantity !== null) {
        return true;


namespace AdmNetsuitePQ\NetsuitePQ\Api;

interface ProductUpdateInterface
     * Update product quantity and price
     * @param int $productId
     * @param float|null $price
     * @param float|null $quantity
     * @return bool
     * @throws \Magento\Framework\Exception\NoSuchEntityException
     * @throws \Magento\Framework\Exception\InputException
     * @throws \Magento\Framework\Exception\StateException
     * @throws \Magento\Framework\Exception\LocalizedException
    public function update($productId, $price = null, $quantity = null);


<?xml version="1.0"?>

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">

    <module name="AdmNetsuitePQ_NetsuitePQ" setup_version="1.0.0"> </module>



<?xml version="1.0"?>
<routes xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    <route url="/V1/product/update" method="POST">
        <service class="AdmNetsuitePQ\NetsuitePQ\Api\ProductUpdateInterface" method="update"/>
            <resource ref="Magento_Catalog::products"/>
            <parameter name="productId" force="true">%productId%</parameter>
            <parameter name="price" force="false">%price%</parameter>
            <parameter name="quantity" force="false">%quantity%</parameter>

Now when I am sending data via postman

POST /rest/V1/product/update HTTP/1.1
Host: my_site.com
Content-Type: application/json
Authorization: OAuth oauth_consumer_key="j9q7uilt4trla8hsi5lo1gtbtuh46icr",oauth_token="df4lz1gasp0su25rbwnp225kxfwknehn",oauth_signature_method="HMAC-SHA1",oauth_timestamp="1678733662",oauth_nonce="kfxspsm3a2n",oauth_version="1.0",oauth_signature="sdKx5cO%2BU7fePuKPWfgZy5ZCAks%3D"
Cookie: PHPSESSID=23vl60opom23c1gfqalnh914e9
Content-Length: 65

    "productId": 122,
    "price": 0,
    "quantity": 12

{ "message": "Invalid type for value: "%productId%". Expected Type: "int"." }

Please help to solve this error. Please check my module code is correct or not.

1 Answer 1


You should specify the data type of productId argument as int in your function, like so:

public function update(int $productId, $price = null, $quantity = null)
    // logic goes here

Also, I should mention that it is good practice to specify data type of function arguments and function return result whenever possible (safely for PHP 7 and up). That is, your function declaration should look like this:

public function update(int $productId, ?float $price = null, ?int $quantity = null): bool
    // logic goes here

Hopefully this will help, otherwise please let me know so I can provide further assistance.

Happy coding!

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