function wpf_add_custom_order_status() {

    // Add all statuses.
    foreach ( array_keys( wc_get_order_statuses() ) as $orderKey ) {
        $orderStatusName = str_replace( 'wc-', '', $orderKey );
        add_action( 'woocommerce_order_status_'.$orderStatusName, array( wp_fusion()->integrations->woocommerce, 'process_order' ) );
    }

}

add_action( 'wp_fusion_init', 'wpf_add_custom_order_status' );