They have rotating categories that are available for the 3% discount. So, if you purchase several items at Amazon you will receive 3% on items that fall within the current category, the price of the remainder of the items will receive 1% if you use the Amazon credit card. So if the category is beauty products and you purchase some beauty products as well as some clothing and household items, you will receive 3% cashback on the beauty products and 1% on the clothing and household items. To know which items will fall into the 3% earning category check Ebates website. Also, when you join Ebates you will have a cashback button in your browser. The button will automatically alert you when cashback is available. In some cases it will even automatically apply the cashback.