^ Satan Cash's method is more reliable, because if implemented correctly, the first webmaster to send the visitor to the website will receive the sales credit.
With your method if a user decides to purchase later, goes to google, and finds your site using another affiliates website, then original webmaster loses the sale. Even though he was the one to send you the visitor initially.
Satan Cash's method would only fail if the users ip address changes, but either way it still should improve your odds of being credited with the sale.
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subarus.
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