You can access your billing details and payment receipts under your profile at https://www.eventcreate.com/dashboard/profile.
You can also access this page with these steps:
Click on the avatar at the bottom left of your event dashboard and select Manage Profile.
Scroll to the bottom of your Account Information page and click View Billing.
A pop up box will appear wtih your billing history. You can then view, email, or print your past billing invoices or receipts.