Steps to get your invoice:

Go to My Account
Sign in and open your account dashboard. You'll find it at the top right of the website.
Open Subscriptions
Select Subscriptions from the menu to locate your active plans.
Select Manage
Choose Manage next to the subscription you need an invoice for.
Find your invoice
In Billing History, select Invoice next to the item you want. To find older invoices, select View all.
Download or print
Take a screenshot, print the page or download it to keep a copy of your invoice.