Always use a jump script where possible. That way you can check the server logs or your stats to get information such as the amount of raw clicks in a day or even the uniques and the countries of the visitors. You might be very, very surprised what some sponsors are doing

Keep in mind some level of discrepancy should be expected but I would say anything under 90% is suspect and under 80% is definitely suspect. Be sure to check whether they count things like chinese and turkish traffic.
Here is a very simple jump script.
Quote:
<?php
$link = "http://sponsorurlhere";
header("Location: $link");
exit();
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Some sponsors might see that you are using such scripts and may decide not to mess with your traffic as much.
