Is it safe to pay for purchases on Google Play from a Megafon account via SMS to 8424?

Question

Payment systems

When trying to buy, it is proposed to choose payment from the account of the mobile operator, after which the system asks for permission to send an SMS to number 8424.
Here it says that these are Megafon mobile payments (although the region is not mine). The Megafon consultant knows nothing. The search did not find reliable sources with complete information.
Who experimented, what is the experience?

Answer 1

From some time on, ALL requests for short numbers should be asked again by the system for the subscriber's real desire to make a call / payment to a short number. It seems to be already enshrined in law.