View your purchase history on Facebook
If you’ve purchased Facebook credits, or made any payments through apps of any kind, then you’ll have a purchase history.
You can actually check that purchase history through Facebook. To do so, head to your Settings page, and then on the left-hand side of the screen select “payments”.
On the page, one of the options will be to check your purchase history. Click on “view”, and you’ll be able to see the entire document.