[INVOICEUPSELLQTY1] - quantity of upsell item 1 (number can be between 1 to 20)
[INVOICEEXTRAITEM1] - value of extra invoice item 1 (number can be between 1 0 to 20)
[INVOICEEXTRAITEMNUM1] - as per [INVOICEEXTRAITEM1] but the value is displayed with a decimal point and no thousands separator.
[INVOICEEXTRAITEMQTY1] - quantity of extra invoice item 1 (number can be between 1 0 to 20)
[UPSELLTABLE] - table with all upsell items
[INVOICEACCOUNTTEMPLATE4] - template value 4 of the invoice account the invoice is assigned to or blank
== Invoicee Variables ==