How to disable Cart Custom Discount / Cart Custom Item Discount on POS

 You can do it by add this code to your_theme/functions.php

function custom_pos_discount_permission($session_response_data){
    
    $session_response_data['setting']['pos_disable_item_discount'] = 'yes';
    $session_response_data['setting']['pos_disable_cart_discount'] = 'yes';
    return $session_response_data;

}
add_filter('op_get_login_cashdrawer_data','custom_pos_discount_permission',10,1);