https://thaiprepaidcard.com/product/360-day-mobile-phone-validity/
This is the website. You’ll get 12 SMS notifications, each of which alerts you that a 10 baht top-up has been effected to your SIM card. Therefore after 12 top-ups, your balance will be increased by 120 baht which could be used for local or overseas calls, subscribing data plans etc.