In the realm of invoicing through, users are presented with various invoice types, one of which is the proforma invoice.

Crucially, a proforma invoice serves a unique purpose. It's not to be confused with a tax or accounting document. Typically, it's dispatched by the supplier to the contracting authority before the actual accounting document is generated. This proforma invoice often acts as a quotation for the customer and can serve as a basis for processes like deposit payments, among other uses.

The process itself is remarkably straightforward, primarily requiring essential customer and supplier information, including their respective ID numbers.