Remote api and permissions in manifest.xml visual-studio

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C#

Visual-Studio

Android

Xamarin

I am developing my first app in android (C# Visual-Studio)

And its basically a wallpaper application that will allow you to search for anything, lets say "Cats" then provide you with a a bunch of pictures of cats and then you can choose one and save to your phone.

And to my knowledge it needs to be downloaded through a remote API

its basically going to be saving, and setting the users wallpaper. I need to request for extra permissions. Since the wallpaper will be downloaded from a remote API, I also need internet access, so request that via AndroidManifest.xml

So my first question is, How do I set permissions in Visual-Studio for the Remote API in Manifest.xml

And my second question is, what Remote API should I use, what do you recommend?

What I have tried:

Asking for help on stackoverflow & forums and trying to find some guides online