shopify api returns status code 400 Bad Request with my php codeigniter app

Question

am able to update product title successfully but when i try making a request to shopify api to update my product image alt i keeps getting status code 400 Bad Request ... here is my code below ... I would be thankful for any help

    public function alt(){

    function __construct() {
            parent::__construct();
            $data = array(); //Always define $data in the constructor to make it available throughout your code
        }

    //getting shop info to access the app
    $store_name = $this->session->userdata('store_name');
    $this->load->database();
    $this->load->model('Store');
    $storeinfo_data=$this->Store->load_store_info($store_name);
    $store_name_db = $storeinfo_data->store_name;
    $store_name_tk = $storeinfo_data->access_token;
    $store_name_url = $storeinfo_data->myshopify_domain;
    $this->data['storeinfo']=$storeinfo_data;               




    if($store_name == $store_name_db){

        //authenticating app with shopify api to be alble to access shop info
    $sc = new ShopifyClient($store_name_url, $store_name_tk, SHOPIFY_KEY, SHOPIFY_SECRET);

    //making a GET request to shopify api for shop products 
    $shop_products = $sc->call('GET', '/admin/products.json', null);

    foreach($shop_products as $product) {
        $product_id = $product['id'];
        $product_d = $sc->call('GET', '/admin/products/' . $product_id . '/images.json', null);
        echo "<pre>";
        print_r($product_d);
        $position =  "1";
        $key = "alt";
        $value = "new alt tag content";

        $metafields =  array(
            "key"=>"alt",
            "value"=>"new alt tag content",
            "value_type"=>"string",
            "namespace"=>"tags"
        );

        $image = array(
            "id"=> "16827152131",
            "position" => 1, 
            "metafields"=>$metafields
        );

        //making a request to update image alt of a product in shop 
        try{
            $shop_product = $sc->call('PUT','/admin/products/8445495491/images/16827152131.json', $image);
        }catch( Exception $e ){
            echo '<pre>'; 
                print_r($e);

        }
        exit();





    }



    }else{

    }


}

and here is the output i get

)

Josh Brown · Accepted Answer · 2016-09-27 01:29:48Z

I noticed a few things here. The image data has to be contained in an {"image": ... } object and the metafields should come as an array. Also, if you are modifying an existing metafield then include the metafield ID in the payload.

Try replacing this:

    $image = array(
        "id"=> "16827152131",
        "position" => 1, 
        "metafields"=>$metafields
    );

with something like this:

    $image = array("image" => array(
        "id"=> 16827152131,
        "position" => 1, 
        "metafields"=> $metafields
    ));

And replace this:

    $metafields =  array(
        "key"=>"alt",
        "value"=>"new alt tag content",
        "value_type"=>"string",
        "namespace"=>"tags"
    );

with something like this:

    $metafields =  array(array(
        "id"=> 123,
        "key"=>"alt",
        "value"=>"new alt tag content",
        "value_type"=>"string",
        "namespace"=>"tags"
    ));

123 would be the ID of the metafield that you are looking to modify. You can obtain that ID using an API call like this: GET /admin/metafields.json?metafield[owner_id]=16827152131&metafield[owner_resource]=product_image

You can find examples of the correct format here: https://help.shopify.com/api/reference/product_image#update

Hope this helps!

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