So even I accepted PassKit answer, here I want to add one note. The accepted answer is correct, no doubts, after my account expired, wallet file generator continued to work because certificates were valid and everything was just fine.
But what happened to me is either bad luck or I don't know. So, when my account expired as I said, everything was fine, except opening wallet files on iPhone. So I was always getting an error "Safari can't download this file". I tried everything but only one thing solved my problem:
New developer account subscription
After I order my new subscription I just generated new Pass Type certificate, updated my web service and server to work with new certs and with new team id and at that point I was able again to load my generated wallet files into iPhone Wallet App.