I'm really jealous to say this, but I think he/she means 90 (iem). The superscript "0" usually means "nth" in English. It sure is possible there, thanks to Northowl, but what a bag of work. If, indeed it is 90th this person needs a reward really quick before their fingers fall off.
I think I'm impressed.
Hmm even for all my payments combined it will take a lot of time to reach the 90 payments but this guy then seems to be a master. I have seen some big payments in PTCs but this big number I haven't seen even the GPTBank reaching this mark.
Its really cool...