This is also the electronic version of an older, paper based system, called Nota Fiscal (lit Fiscal Receipt) ... legally, every single item carried around the country must have one. Of course this was/is a major enabler for selective police action against "undesirable people" moving trivial stuff from a home to another, etc.
Huge difference.
we were told to use specific software. and for sure that software is created by some company that may or may not be government owned. i don't know if there was any choice since, as is typical with foreigners, someone will just tell me their recommendation and not try to explain the differences between choices, unless they matter. ie: just go with the default.
i did have the impression that different regions use different software at least.
i expect that potentially in european countries there are multiple competitors for the same software, but i don't know that either.
so for all i know the amount of choice and control in china could be the same as some countries in europe.