Invoice Plugin recommendation?

I’m looking for a plugin that will allow my customers to generate their own invoices? There are a lot of plugins that allow me to create invoices through wordpress but I want my customers to be able to have their invoices automatically generated and available straight away.

My invoices arent complicated, it would be a very standard invoice form with no price/product variations, it would only be the client name/date/invoice number that varies. Also my customers dont need to pay through the invoice so it doesnt need to be linked to a payment system.

If not an invoicing plug in then maybe some kind of form plug in that would do the same thing?

Any advice appreciated, thanks