[INVOICEETEMPLATE8] - template value 8 of the invoice account the invoice is assigned to or blank
== Guest Variables ==
[GUESTIDS] - comma separated list of guest Id's connected to the booking
[GUESTFLAGTEXTS] - comma separated list of flag text values for each guest (when not empty) connected to the booking
[GUESTSNUMGUESTS] - the number of guest records created for this booking.
== Payment Request Variables ==