send email to notify customer about china bankslip and instruction to upload po

app/Notifications/UploadPo.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace App\Notifications;
+
+use App\Booking;
+use Illuminate\Notifications\Messages\MailMessage;
+use Illuminate\Notifications\Notification;
+
+class UploadPo extends Notification
+{
+
+    /** @var Booking */
+    private $booking;
+
+    /**
+     * UploadPo constructor.
+     * @param Booking $booking
+     */
+    public function __construct(Booking $booking)
+    {
+        $this->booking = $booking;
+    }
+
+
+    /**
+     * Build the mail representation of the notification.
+     *
+     * @param  mixed  $notifiable
+     * @return \Illuminate\Notifications\Messages\MailMessage
+     */
+    public function toMail($notifiable)
+    {
+        $message = new MailMessage;
+        $message->line('您好, 订单号 : '.$this->booking->id.' 的人民币汇款已成功。 请在这个网址 http://exchange.cief-malaysia.com/ 登录您的账号，并点击以下按钮，上载PO到系统. 谢谢.')
+            ->line('The payment to your supplier for the order no: '.$this->booking->id.' has been successful, please login to your account at http://exchange.cief-malaysia.com/ and then click on the button below upload your order\'s po');
+        foreach ($this->booking->chinaBankSlip as $bankslip){
+            $message->attach(Storage::disk('public')->url($bankslip->china_bank_slip_path));
+        }
+        return $message;
+    }
+}