I needed a simple system to invoice my clients.

What is great with Envoice is that you set your client language in his profile and he will receive his invoice in the correct language.
I use it with both French and English clients and love it.
It integrates with SquareUp (which I needed) and many other payment processors.

The store sends emails in English only for now, but works well.
You get a lot of value for a small investment.. for a LTD.
Superb deal!