[INVOICEUPSELLDESCRIPTION1] - description of upsell item 1 (number can be between 1 to 20)
[INVOICEUPSELLAMOUNTNUM1] - amout of upsell item 1
[INVOICEUPSELLTYPE1] - type of upsell item 1
[INVOICEUPSELLPER1] - per of upsell item 1
[INVOICEUPSELLPERIOD1] - period of upsell item 1
[INVOICEEXTRAITEMDESC1] - Name of extra invoice item 1 (number can be between 0 to 20)