TheoTown

I want make a cultural house for me only and I want add some income in it, but I don't know to make it and I try the json code experiment it was failed. Would you tell me and share your opinion here?

You need to be a trusted plugin creator, once your application to the group was approved (and you have published high quality plugins, as long as they are not suspended from the store) the devs will send you a privileged code via PM

So I must be a trusted plugin creator to add income to my plugin?
That's very expensive btw.