push-уведомления

I have a problem with push tokens in IOS 13 and higher. As you know, they come in this version in the format {length = 32, by ... SData format, and in my database, push tokens are stored in rows. Such a question - how to convert a string to NSData in php?

I'm just getting started with firebase. When I made the app, I placed my sounds in the /res/raw folder and then push came wit ... owser. How do I make my own sound there? And another question: is it possible to play the sound when the user is on the site?

In general, the question is probably somewhat general, but nevertheless, someone can tell you. About a month ago, I screwed u ... explain where the FCM jambs are, where the browser jambs are, where mine are, and how reliable the web push is for sending.