Klen

I was wondering that too,so i dived in and i can tell - it is freaking awesome,and i think every program should have that enabled.It is better then classic XML api as it get info only what you really need(XML usualy output all info and then you proccess data which you need).

So here how it works: you put your domain into program system in following format:
domain.com?value1=a&value2=b

Value1 could be a campaign name,and value2 could be amount of sale,so a generated url would look like this:
domain.com?value1=mynetwork&value2=14.98$

So a program server will generate such url everytime when sale is generated,and load it.
When it is loaded(and loading means same as you would copy that url into browser and load it),you can process that info,using any of server langauges (php,ruby,asp,perl,whatever),by writing it to file,or database and then you can have a single place for checking your stats.And that is what make this thing awesome,as with it you dont need to login into control panel anymore,nor use overpriced stats software.

In case you want more info about sale beside campaign and amount,then url would look like this:
domain.com?value1=mynetwork&value2=14.98$&value3=b labla
(you add another & for additional value)

Only sideback of this how you could start suffering from refresh-o-mania