CartApp
This is a cartApp.
It supports register a new customer and use the newly created customerId to shop.
In the main screen, press 1 for register, press 2 for shopping.
In the shopping page， you can add your products in the cart and then check out.
In the checkout page, we will give you the total and you can choose to pay or go back to add more products. You can also input whether you have coupon or not.