class Refund
{
    /**
     * AmazonPay module object
     *
     * @var AmazonPay
     */
    private $module;

    /**
     * Sets `$module` member var with dependency injection.
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param AmazonPay $module
     * @return void
     */
    public function __construct(AmazonPay $module) {
        $this->module = $module;
    }

    /**
     * Issues refund then returns Amazon Pay transaction info and history
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param mixed $args ['orderId', 'refundAmount']
     * @return array
     */
    public function post($args) {
        $orderId = (int)$args['orderId'];
        $amount = $args['refundAmount'];
        $order = new OrderMeta($orderId);

        (new API\Refund\Create($this->module, $order))->post(
            $order->getChargeId(),
            $amount,
            $order->getPaymentCurrency()
        );

        return (new SettlementInfo())->get($args);
    }
}