This is a method from the KashFlow Accounting Software SOAP API

Description

This method returns a string containing the address of a PDF file containing your invoice(s).

You can provide an integer if you just want to print one invoice, or a comma separated list of invoice numbers if you want to print more than one invoice.

Parameters

IN
InvoiceNumber
Integer
The invoice number for the invoice you want to print.
If you are instead supplying a string of numbers in the
next argument then you should set this to 0
IN
InvoiceNumberList
String
A comma separated list of invoice numbers.
You can just provide an empty string if you are
providing a single invoice number above.