Once a potential customer clicks a link with your affiliate ID in it, if they return anytime within 30 days and make a purchase, you will receive commission on that purchase. The commision isn't based on just the item you link to - the commision is based on the entire order. So, if someone arrives at HolidayCoro based on a referal to our RGB Video Series but purchased $100 worth of products, you receive commision on the entire $100 in products.