Set new orders to be on hold in WooCommerce on child sites.
Snippet Type
Execute on Child Sites
Snippet
add_action( 'woocommerce_checkout_create_order', 'force_new_order_status', 20, 1 );
function force_new_order_status( $order ) {
if( ! $order->has_status('on-hold') )
$order->set_status( 'on-hold', 'Forced status by a custom script' );
}