Does anyone know how, or if, there is some kind of invoice feature in the Events module? Or do folks just use the general Mail feature?

We use participant export to create an invoice.(сonditional merge) Works like a charm!

 Awesome, thanks!

 Part II of my question: is there a field for amount due? For example, if someone has paid part of their sponsorship amount but has an outstanding balance--here's the catch: the amount was paid by credit card and hasn't been entered as a gift yet...