the app has in app purchase. that page describes both what you described plus paying for in app purchases via operator
> TIM is an Italian brand owned by Telecom Italia. Originally founded as a mobile telephony company in 1995
https://en.m.wikipedia.org/wiki/TIM_Brasil
> Parent Telecom Italia Mobile, Telecom Italia
the app has in app purchase. that page describes both what you described plus paying for in app purchases via operator