PHP variable issues

Hi there.

I’m having a few issues with some code of mine. This is my custom hook function in functions.php.

function GrabExtraOrderInfo($args)
{
    global $wpdb;
    $postid = (int)$args->id;
    $ExtraDimensions = get_post_meta(1872/*$postid*/,'_extraDimensions');
    $Shapeid = get_post_meta(1872/*$postid*/,'_shapeid',true);
    $shapeIdInt = (int)$Shapeid;
    $ShapeTable = $wpdb->prefix . "ShapeData";

    $url = $wpdb->get_results("SELECT $ShapeTable.url FROM $ShapeTable WHERE              id =$shapeIdInt");

    foreach($url as $chunks)
    {echo '<img src="' . $chunks->url . '"/>';}

    foreach ($ExtraDimensions as $values)
    {echo print_r($values);}

    die();
}

My problem is with the get_post_meta id under it’s first argument. If I put an integer directly as a parameter, the data I need is retrieved and it is echoed correctly. However, if I use my $postid variable, the function prints nothing. Now, if I debug the $postid variable it outputs the id I need correctly. I assumed that it must be due to it not being converted as an integer but my string to int conversion as made no difference.

The parameter $args is the order object sent from the order email (woocommerce)