Add custom order statuses to the whitelist.

update-order-status-allow-list.php

<?php



/**
 * Add custom order statuses to the whitelist.
 *
 * @param array $whitelist The default whitelist of allowed status transitions.
 *
 * @return array Modified whitelist including custom statuses.
 */
function dokan_support_add_custom_order_statuses( $whitelist ) {
    $custom_statuses = [
        'wc-pre-envio'  => [ 'wc-processing' ],
        'wc-refund-req' => [ 'wc-processing' ],
        'wc-delivered'  => [ 'wc-completed' ],
    ];

    foreach ( $custom_statuses as $status => $allowed_transitions ) {
        $whitelist[ $status ] = $allowed_transitions;
    }

    return $whitelist;
}

// add custom order statuses
add_filter( 'dokan_sub_order_status_update_whitelist', 'dokan_support_add_custom_order_statuses', 10, 1 );