If you have not received a purchase order, you can always look at your purchase history.
Amazon.com/Amazon.co.uk
You can view a list of your purchases on the Amazon website by following these steps.
1) Log in on the Amazon website
Go to the Amazon website and log in with your Amazon account.
2) View account
After you've logged in, click on the button "Your Account" in the top right corner.
2) View account
After you've logged in, click on the button "Your Account" in the top right corner.
3) Show purchases
In Your Account window, under Order History, click Your Orders.
Tip: The order history shows purchases made in the past 6 months by default. To view details of previous purchases, use the drop down menu that can be found in the top right corner.
Additional information
You receive an invoice by email each time you've made a purchase.