P2P Promotion: "Interest" or "Fees refund"?

Many P2P platforms have promotions, where you get a percentage or amount, based on the deposit. What would be the best way to register this, as „Interest“ or as a „Fees refund“? Specifically asking as I dont understand yet, if either one does different things in terms of calculations.

both ways should work and are considered in thes earning and performance tab.
Personally I would register them as Interest.

I’d consider them fresh money, like something that you earned from work.