Cashback is credited only for the article net value excluding the value added tax, all other taxes and fees and the additional costs for delivery and shipping.
I just bought and nothing appears, in the extension put cashback activated. I don't know if something else needs to be done.
The cashback may take time to appear reflected in your account up to 24 hours after purchase. As I see the cashback is already in your personal account.
Regards! LetyShops team.