function deleteProductById($productId)
{
    // Convert numeric ID to Shopify GID if necessary
    if (strpos($productId, 'gid://shopify/Product/') === false) {
        $productId = 'gid://shopify/Product/' . $productId;
    }

    $query = <<<'GRAPHQL'
mutation DeleteProduct($id: ID!) {
    productDelete(input: {id: $id}) {
        deletedProductId

        userErrors {
            field
            message
        }
    }
}
GRAPHQL;

    $variables = [
        'id' => $productId
    ];

    $gql_query = [
        'query' => $query,
        'variables' => $variables
    ];

    $fullURL = $this->shopifyStoreURL . '/graphql.json';

    $curl = curl_init($fullURL);

    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
    curl_setopt($curl, CURLOPT_MAXREDIRS, 3);
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);

    $request_headers = [];

    $request_headers[] = 'Content-Type: application/json';
    $request_headers[] = 'Accept: application/json';

    if (!is_null($this->accessToken)) {
        $request_headers[] =
            'X-Shopify-Access-Token: ' . $this->accessToken;
    }

    curl_setopt($curl, CURLOPT_HTTPHEADER, $request_headers);

    curl_setopt(
        $curl,
        CURLOPT_POSTFIELDS,
        json_encode($gql_query)
    );

    curl_setopt($curl, CURLOPT_POST, true);

    $response = curl_exec($curl);

    if ($response === false) {

        echo "cURL ERROR deleting product "
            . $productId
            . ": "
            . curl_error($curl)
            . PHP_EOL;

        curl_close($curl);

        return false;
    }

    curl_close($curl);

    $responseJson = json_decode($response);

    /*
     * GraphQL-level errors
     */
    if (isset($responseJson->errors)) {

        echo PHP_EOL;
        echo "GRAPHQL ERROR deleting product "
            . $productId
            . ":" . PHP_EOL;

        print_r($responseJson->errors);

        return false;
    }

    /*
     * Check response structure
     */
    if (
        !isset(
            $responseJson
                ->data
                ->productDelete
        )
    ) {

        echo PHP_EOL;
        echo "INVALID DELETE RESPONSE for "
            . $productId
            . ":" . PHP_EOL;

        print_r($responseJson);

        return false;
    }

    $deleteResult =
        $responseJson
            ->data
            ->productDelete;

    /*
     * Shopify user errors
     */
    if (
        isset($deleteResult->userErrors) &&
        count($deleteResult->userErrors) > 0
    ) {

        echo PHP_EOL;

        echo "SHOPIFY ERROR deleting product "
            . $productId
            . ":" . PHP_EOL;

        foreach (
            $deleteResult->userErrors
            as $error
        ) {

            echo "  ";

            if (
                isset($error->field)
            ) {
                echo implode(
                    '.',
                    $error->field
                );

                echo ": ";
            }

            echo $error->message
                . PHP_EOL;
        }

        return false;
    }

    /*
     * Successful deletion
     */
    if (
        isset(
            $deleteResult->deletedProductId
        ) &&
        $deleteResult->deletedProductId !== null
    ) {

        echo "DELETED: "
            . $deleteResult->deletedProductId
            . PHP_EOL;

        return true;
    }

    echo "Product was not deleted: "
        . $productId
        . PHP_EOL;

    return false;
}