It must be calculated based on the transaction amount, and the refund rate must also be included! Other than that, any algorithm is a pitfall.

If the store is not run well by the operator and the store is not profitable, it is useless to have good data. Some agents will give the store fake orders, and the fake orders are all low-quality users, which makes it very difficult to operate in the later stage! In serious cases, the store may be closed, so choose carefully~