Where do I modify it so that it displays the address for US users properly. It's quite interesting and mailman unfriendly. Need it to be formatted in the US as follows: Person Name: Company name: address number address street address apartment suite number City then state then zip code and it isn't doing that.
It's the way addresses are formatted in europe. The PDF file is generated by the files in /usr/local/ispconfig/interface/web/billing/templates/pdf_invoice/default/ Replace default with the name of the template that you use, in case you don't use the default template. The source file is commented.
The name is 'state'. Take a look at the database table "invoice", the column names are the field names.