Run the action, OOO campaign, the essence of which making money on the customer's mobile phone for certain actions.
The problem is that it is not clear where and how to replenish the customer account from the point of view of the law and technical issues.
It is clear that you can just throw the "left" number, but what of the identity of the company? Must be signed in the SMS or the information that made the payment for the shares, because the client is not clear where the payment and for what.
Already a head broke.
If you have experience in this field, please tell me how you implemented the paying client on the phone?
The legal form of "LLC"