JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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You can find your invoice in the account billing page. Here's the link: http://www.jotform.com/myaccount/billing.
Here's our guide: https://www.jotform.com/help/329-How-to-Check-Invoices
Hope that helps. If you need anything else, contact us again.