Webview iOS and Android app with social login support -- 2

Hello, I hope y'all are doing well. Below are the details of my project and I hope you will be able to do it as requested. 1. I have a wordpress listing website, which I would like to have it run only in iOS and Android app, here is the URL: [login to view URL] 2. I was able to use those universal templates from codecanyon, but the main issue is that those templates don't work well with social login and links that are supposed to be opened on a new page or tab. 3. So my main preoccupation is to build a web view app that would be able to allow facebook, google, twitter login, which work fantastically on the website in all normal browsers out there. Also I have facebook messenger integrated on the website which required facebook login as well, it has to be able to open a new page within the app for login and after successfully being connected a redirection should send the user back to the main site. 4. Do I get the source code of the apps mainly for future upgrades purposes, and how is the package licensed. Thanks for your time and I hope I was quite clear and explicit.