Transactions must be completed immediately and wholly online via your Currensea account to be eligible for cashback.
What this means is that you can't click through to a merchant and place items in your basket and then come back and purchase them at a different time. Or you can't generate a quote, save it, and then come back and purchase that saved quote.
You can go back and make a purchase with the merchant if you want, but you must start the process from the beginning again, not using any previously saved quotes or shopping baskets.
If you want to shop around and try to find the best deal, this is fine, but once you know where you want to make your final purchase from, we would advise that you clear your cookies before you complete it to ensure that your sale is credited to Currensea and not another website.