[TYPO3-commerce] marker for total amount in ###FINISH### part of checkout.tpl

[hartmut]

Hi,

is it possible to use a marker for the total amount of purchase in the 
###FINISH### part of checkout.tpl?

Tried ###SUM_GROSS###, but it isn't replaced.

I want to pass the amount to an affiliate program like this:

<img 
src="http://www.domain.tld/affiliatepro/callbacks/callback_sample.php?amount=###SUM_GROSS###" 
width="1" height="1" border="0" alt="" style="visibility:hidden">

best regards
hartmut