As an affiliate, how can we get more information on sales?

It looks like the goals feature in GA is for those who have control over the receipt page. But we are sending users away using an affiliate link.

With event tracking, we've been able to count the clicks and see which links are being clicked the most, but not which ones actually convert.

We want to find out the following on each sale:

1. Did the converted user come from search or internal traffic?

2. If it was search, which keyword brought the user to our site (and clicked away and converted)?

Is it possible?