wpsc_shipping_modules

Filter to allow external plugins to register shipping modules.

function my_shipping_add($wpsc_shipping_modules) {

    global $my_shipping;
    $my_shipping = new my_shipping();

    $wpsc_shipping_modules[$my_shipping->getInternalName()] =  $my_shipping;

    return $wpsc_shipping_modules;
}

add_filter('wpsc_shipping_modules', 'my_shipping_add');