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The current username caiena you're logged in is on a FREE plan. So it doesn't have any billing payment invoice.
Were you perhaps referring to another username? I think its the username stonegatesl
If you can login to the other username you can check the billing payment invoice.
You can find the invoices in the account billing section. Here's the link: http://www.jotform.com/myaccount/billing
Here's our guide: https://www.jotform.com/help/329-How-to-Check-Invoices