#1 Go to Admin>Payment>Advanced>Order Totals
DELETE all your Order Total modules installed and we need to RE-INSTALL them including the Booking Fee (per ticket) module. (this is so that we get a correct order of modules that calculate the costs)
Set the Booking Fee at a Flat Rate or Percentage as shown.
SAVE this module
#2 Set the language file
We may need to edit the language file...
Includes/languages/english/modules/order_total/ot_service_fee.php