Cookies are so 1999
I am pretty sure there are no affiliate programs out there that rely just on cookies. Most will have IP tracking, or a combination of both.
When a surfer clicks your affiliate link his IP address is stored in a database together with your affiliate ID. If there is a join from this IP address, the sale will be credited to you.
Of course not everyone has a static IP, but together with cookie and session tracking this still should cover at least about 80 - 90% of all surfers. I think it is pretty normal that about 10% of your traffic won't get tracked at all.
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