NOTE: This feature is NOT implemented yet and DOES NOT WORK currently!
You can add &aff_custom= to your affiliate link URLs (this is sometimes called a "sub-ID"). For instance, if your standard E-junkie-issued Affiliate Hop Link code looks like this example:
<a href="https://www.e-junkie.com/ecom/gb.php?cl=XXXXX&c=ib&aff=YYYYY" target="ejejcsingle">Click here to visit MERCHANT NAME website!</a>
...then this part would be the actual link URL:
https://www.e-junkie.com/ecom/gb.php?cl=XXXXX&c=ib&aff=YYYYY
...so if you wanted to track all sales which resulted from, say, an AdWords campaign, you could modify the URL like this before you submit it to AdWords:
https://www.e-junkie.com/ecom/gb.php?cl=XXXXX&c=ib&aff=YYYYY&aff_custom=adwords
If you're pasting the full Hop Link code into various sites and pages, then the modified URL would look like this in your Hop Link code:
<a href="https://www.e-junkie.com/ecom/gb.php?cl=XXXXX&c=ib&aff=YYYYY&aff_custom=SUBID" target="ejejcsingle">Click here to visit MERCHANT NAME website!</a>
Whatever value you put after the &aff_custom= is entirely up to you (but stick to letters and numbers with dashes-and_underscores only to be safe), and of course you should make this value different for every location where your place a link. That value will be passed through any transaction where you earn a commission to show up in your sale reports, so you can see which specific links resulted in which specific sales and commission earnings.