Hi,

To overwrite the 'apply_discount' function in the pos_discount module in Odoo 15, you can follow the code below:

odoo.define('Custom.DiscountButton', function (require) {

'use strict';

const Registries = require('point_of_sale.Registries');

const DiscountButton = require('pos_discount.DiscountButton');

const CustomDiscountButton = DiscountButton =>

class extends DiscountButton {

async apply_discount(pc) {

// Add your custom code here

}

}

Registries.Component.extend(DiscountButton, CustomDiscountButton);

return DiscountButton;

});

Ensure to add the js file to the manifest under assets:

'assets': {

'point_of_sale.assets': ["path"]

}

Replace "path" with the actual path to your js file

Hope it helps