Hi there,

I made a modification to MarketKing Core (attached) that adds a new hook to assist with this. Please first update to the attached version.

We can then use this hook and code snippet to determine if the COD reverse behaviour can be applied or not:

add_filter('marketking_apply_cod_reverse', function($apply, $order){
    
    return $apply; // true or false
}, 10, 2);

Specifically to allow cod reverse only for local pickup and vendor shipping I believe you can use:

add_filter('marketking_apply_cod_reverse', function($apply, $order){
    $method = reset($order->get_shipping_methods())->get_method_id();
    if ($method === 'marketking_shipping' || $method === 'local_pickup'){
        // continue
    } else {
        $apply = false;
    }
    
    return $apply; // true or false
}, 10, 2);

Kind regards,

Stefan