notes for Woocommerce setting orders automatically to complete:
// Auto Complete all WooCommerce orders. add_action( 'woocommerce_thankyou', 'custom_woocommerce_auto_complete_order' ); function custom_woocommerce_auto_complete_order( $order_id ) { global $woocommerce; if ( !$order_id ) return; $order = new WC_Order( $order_id ); $order->update_status( 'completed' ); }
src
http://docs.woothemes.com/document/automatically-complete-orders/