[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
== Payment Request Variables ==
[PAYPALBUTTON:200] - Creates a Paypal payment button for a fixed amount. A zero amount will cause paypal to provide a field to enter an amount. Not recommended for emails.
== Mathematical Operators ==