<?php

class RefundService {

    public function refundOrder($order, $amount)
    {
        if(isset($this->refunds[$order->vendorTxCode])) {
            $this->refund[$order->vendorTxCode] += $amount
        } else {
            $this->refund[$order->vendorTxCode] = $amount
        }
    }

    public function flush()
    {
        foreach($this->refund as $vendorTxCode => $amount) {
            performRefund($vendorTxCode, $amount)
        }
    }

}