So I was about to buy some CE with my phone credit. Then it dawns on me... Isn't it nice if I could buy those packs? That is not an option with Boku though. Max I can buy is about 10 myr which is about 3.19 usd...

I am suggesting something like Onebip. I used it to buy stuff from other MMOs before.

Better yet, implement something similar to the energy depot.