Finb/Bark ? reverse-engineered prompt

Build me an iPhone app that lets me receive custom push notifications from a simple URL or API request.

I want it to feel clean and easy to use, where I can open the app, copy my unique key or test link, then send a notification by calling a URL or making a POST request. It should support a title, subtitle, and body, plus extras like opening a link when I tap it, grouping messages, custom icons, custom sounds, and repeated alert sounds for urgent messages. Please also include support for time sensitive notifications and critical alerts, and make sure encrypted pushes and self hosted server support are part of the experience for privacy.

Keep the app polished and reliable, and make the notification handling work well on iOS. If you need current Apple docs for notification behavior or permissions, look them up online first.