If affiliate A did not manage to convince the customer to buy using his link, then hard-cheese, the affiliate B managed to do it later (even if by a fluke, if you like).
It is a little too hypothetical to say affiliate A must have preconditioned the customer to buy the product, so deserves some or all of the commission. It might be theoretically true to some small extent, but if they had done a proper job in the first place and presold the product effectively enough, then the customer would have bought there and then during the visit using affiliate A's link.
Last cookie set counts.
Unless into the 180solutions scenaro of {scum spyware affiliate link hijackers}, when it is definitely not fair or ethical, or possibly even legal, for the last affiliate to be paid for the sale, if that is from link hijacking, replacing the affiliate A referral ID with the hijacker's ID for the clickthrough that results in a sale.
Trouble is, how to sort out the two scenarios and alter the payments to the right affiliate?
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