Temu has 30% Cashback rate for new customers 5% for returning customers (But we are all new customers right? ;)). Seems to be uncapped.
Cashback is ineligible on the following:
Purchase of gift cards or use of gift cards for full or partial payment.
Purchases using coupon codes not listed on Cashrewards.
Items that are cancelled, returned, exchanged or refunded.
GST, other taxes and delivery fees.
Fraudulent transactions.
Purchases using any type of discount which lowers price advertised on the Merchant site, including but not limited to employee discounts, student discounts and price-matching.
View other info via the link
Usual "dont use the app" warning