Fluentscript access to sambapos variables / values

[Aryanking]

@emre ok thanks for update.{ORDER STATE TOTAL} solved the initial problem of applying the Service Charge, however :

@Aryanking

My main issue now is if a user goes to payment screen then for some unexpected but valid reason wanted to remove the one and only kitchen order from the ticket before payment is made. At that stage, i already applied the Service Charge via the custom calculation script, so how can i remove/reverse the Service Charge from the ticket to make a provision for this type of scenario?

Is it possible to use some other variables\ references equivalent to the printer tags in question (e.g. [:Service] or Ticket.StateName/Ticket.State or Ticket.OrderStateTotal, etc) to achieve this type of Service Charge Toggle effect that i aim for?