Using AliDropship Google Chrome extension you can easily generate invoices for every order you placed on AliExpress for a certain period in one click.
Go to AliExpress → My account → My Orders → Your company info, fill in all fields with information and click Save:
Select dates for generating bulk invoice (or tick on checkboxes near the order you need) → click Search (we do not recommend to generate invoice for all orders in your account, because AliExpress can restrict your account for a while) → click Generate Bulk Invoice:
When invoice is generated, you will see Invoice number which is generated randomly, your company info, AliExpress' business name and address, your orders details.
At the bottom of the page you will see totals:
Price per item;
If you paid your orders in different currencies, they will be shown separately:
You also can generate invoice for a single order, just click Generate Invoice for the order you need:
Now you can print the invoice.