What is the {$extra_data1} and {$extra_data2} for in a banner's Destination URL ?

The {$extra_data1} and {$extra_data2} can be used to forward some value to the merchant's website. 

Example:

What if a merchant has a site  www.merchantsite.com/?productid=12345  where he wants the product id to be changed dynamically?

In that case, he can set in a banner's Destination URL the following:
www.merchantsite.com/?productid={$extra_data1} 
 
and then for click can be used:
www.merchantsite.com/PAP/scripts/click.php?a_aid=aaa&a_bid=bbb&data1=12345

and that will redirect to www.merchantsite.com/?productid=12345


The value by which the {$extra_data1} is supposed to be replaced has to be entered by the affiliate when he/she gets the banner code in the affiliate panel. So the merchant has to tell the affiliate the available values for that variable.  
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