[BOOKINGDATE:+1day{%A, %e %B, %Y}] - optional date offset and display format. The offset can be any plus or minus any number of days and the display can be any valid PHP strftime format string.
[PAYMENTDATE:{%A, %e %B, %Y}] - most recent payment date
[PAYMENTDATE:+1day{%A, %e %B, %Y}:1:1000] - optional date offset and display format. The offset can be any plus or minus any number of days and the display can be any valid PHP strftime format string. The second parameter specifies the payment to show, 0 or missing means the most recent payment. The third parameter specifies the invoicee.
==Account Variables (account of the booking) ==