EXTRA 1: Add Chinese Formal Invoice Related Functions. » EXTRA1.3: Connect with accountant software "Jin Die"

First:
Add a new area under the "付款方式 and 运输方式"in customer page "购物车" : Type of Invoice (in Chinese: 发票类型)
It shows two different choices:

1. In default, it should be "Electronic VAT general invoice",
2. Formal VAT paper inovice (customer need click it to choose)
   Second:
   We connect our system with "Jin Die" software.
   In accountant's completed orders list in our admin area, it should show different color/way for two different invoices needed.
   For those ordered with "Electronic VAT general invoice" needed, our accountant click button "confirm" or "invoice print", then our system sends an email with printable invoice in pdf version to our customer's email account , meanwhile, also upload this file into customer's web account according to the orders.
   For those order with "Formal VAT paper invoice "needed, our accountant click "invoice print" and use current invoice printer to print the invoice , then insert the invoice number into the system.(Jin Die might have their better plug system)

Difficult point:
How do we show/put ONE invoice including serval orders in customer's account page.