Replenishment of the user's mobile account for registration?

Question

SMS

Good time.
It's worth the task. Top up the user's balance to the phone entered by him during registration.
Several options are possible:
1. Ability to send SMS with the payment activation code via a short number.
2.Direct replenishment immediately after registration.
3. Replenishment when sending SMS to a number (crap. But still))).
Are there such services? Or how to organize it.
Interested in all possibilities.
Maybe in some bitcoin there is something like that?))

Answer 1

P.1 Per rectum ad astra. Why do you need to send an SMS to a user when you can ask the user to send a code to a short number? Sending SMS does cost money. In your case, you will pay both for the prefix on the short number and for sending SMS to users.
P.2 Any payment system ala qiwi or huyandex.
Get a wallet. Replenish. Pull the API.
P.3 0_o