iOS Smart App Banner plugin displays the app banners in Safari on iOS. All you need is your application ID.
It's magic. Actually, there is a special meta tag that can go in the web page's header. When it sees it, Safari will pull the app information from the store and display the banner at the top.
No. The banner will display until the user taps the close button. After that, it should stay closed on successive page visits.
In that case, the banner will prompt the user to open it.
It's probably hiding because you've dismissed it already. Try clearing your browser's cookies.
Yup, sure does! Go to wp-admin, then mouse over settings and select "iOS Smart Banner". Deselect the "Donate" option and enter your affiliate ID. Just a note: You are free to use your own affiliate linking with this plugin. If you find it to be useful, we kindly ask you to consider leaving the donate box checked, which will use our affiliate link to help support development of this plugin.
That's a discussion to be had with your app developer (some info in the link below). Basically, you need to have a registered app schema and some way to handle the incoming information before it will be useful.
You can get it directly from the horse's mouth: Apple.com