<a>.
if ($product['productCategoryId'] === self::category) {
$data[$key] = [
'code' => $product['code'],
'id' => $product['id'],
'parentGroup' => $product['parentGroup'],
'price' => $product['price'],
'productCategoryId' => $product['productCategoryId'],
'images' => $product['images'],
];
}