How to top up a buyer's mobile phone account?

Question

Payment systems

We came up with the idea to motivate our buyer with 100 rubles on the phone so that he leaves a review for our company in Ya.Market. I'm just not sure how to do it? Neither legally nor technically. So I'm thinking - maybe there is a contractor?
Nobody faced?

Answer 1

look towards aggregators
some Single Wallet
https://www.walletone.com/ru/wallet/
should allow legally
and even technically - card / webmoney / poison + a bunch of online top-ups