Seems to be working well on 4.2.5
Cheers!

I have vb 4.2.5 and PHP 7.1 and works fine.

Would be good if there was a VB 5 version

I'm having some difficulties getting this to work, or I'm not understanding what it does.

I've signed up for an account at onesignal,
Entered my forum
https://www.caraudiocentral.net

downloaded the files
Uploaded the files to my forum root
https://www.caraudiocentral.net/forums

I then downloaded the plugin, uploaded the 1 file to the includes
and then installed the plugin.
Entered my Keys into the plugin settings
Enabled plugin.

I'm trying with my test accounts to get push notifications and nothing is happening.
I login with my main account on my forum, tried to PM my test account. No notification
Tried replying to a thread. No notification

Are there additional settings that need to be enabled?
Are there settings in the UserCP that a user needs to subscribe? I'm not seeing any but want to make sure.

My forum is running 4.2.5

Is it still enabled at your forum? I do not see the popup for subscribing. Try using the default style.

take a look now. It's odd, all of a sudden the little red bell just appeared.
I hadn't done anything since Friday.

I think it's working, when I reply to PMs from both accounts. I get a little popup lower right corner.

Thanks for the confirmation. Please mark as Installed.

You mention that this is "This is the lite version" Is there a pro?

Yes, this is lite version. I did not see much interest in getting a pro version from the users here, so did not complete the pro version until now. It is almost half done only and I use it on my own forum.

Would be interested in know what additional functionality you have incorporated as this is something I have thought about over the years but never saw anything or commissioned to code it.