When you make a purchase in the Facebook version of the game, a confirmation email with your order information is sent to the email address that you use to log into your Facebook account.
You can also find your order information in your Facebook account by following these steps: https://www.facebook.com/help/248471068848455
If you need to contact us for a purchase issue, please submit a support ticket, by tapping the "gear" icon on the map screen, and then "support," or you can open an online support ticket here.
Please be sure to attach a screenshot of your receipt and make sure that the time and date of purchase is visible.
You can find instructions on how to take a screenshot here: https://www.take-a-screenshot.org/