Where can I see the actions for repeat customers?
Impact Radius tracks signup, credits added and purchases of new customers only. While it does track repeat customer counts (in order to provide the conversion rate metric) the action details are not listed within Impact Radius.
If a new customer clicks on my referral link, how long do they have to purchase before I am not recognised for the sale?
Envato offers a relatively long period of 90 days. This detail can also be found in the credits added terms of the insertion order: "Click Referral Period : Visitor must purchase within 90 days of referral". E.g. If you were wanting to promote this photo: you would copy the item page URL into the landing page field. A personalised media Partner link is generated, which can be copied using the blue “copy link” button. Easy. You may also consider using a link shortener/manager like this one.