Introduce Parameter Object Refactor | Before Refactor

Customer.php

<?php
/**
 * Hard to read the data
 * Repeated values
 * Lacks intent
 */
class Customer {

    function amountInvoicedIn($start_date, $end_date) {
        
    }

    function amountReceicedIn($start_date, $end_date) {
        
    }

    function amountOverdueIn($start_date, $end_date) {
        
    }

}