Hi @remams8 from what I’m reading here I think there may be some confusion between the different APIs.
How were you doing this streaming before? I get the feeling that you were using the Phirehose PHP library to use the statuses/filter endpoint and provide a list of users? Or, were you using Sitestreams previously - in which case, you would still have had to have users authenticate with your app in some way. Are you looking to consume just Tweets, or do you expect to also get events e.g. likes, Retweets, follows etc?
For the Account Activity API, this provides event messages on a per-user subscription basis. You’d need to have users authenticate with your app to get their access tokens to add their subscription. There’s no way to receive events for user accounts other than your own without going through this process.