All toilets in this mall are free. And the toilet that I entered was quite like in a hidden area :D I think not all visitors have ever entered. That's a cool toilet.
Anyway, in which city, which mall do you have to pay a fee for? I've never paid for a toilet in a mall, but in another building, I have.
I forgot where it was, I was traveling that time and I had to pay around 5k for the maintenance of this premium toilet. I think it was either in Surabaya or Jakarta. They were clean for sure so, it was worth the money.