Android App Customization

Hi, i have a working android app ([login to view URL]) in play store. i am planning to do add/changes the following 1. Add : One signal push notifications in android app (Right now i am using only for browsers) 2. Changes : Admob (banner & interestial already there) : But Admob bottom banner missing in some layouts, to be added to all layouts. And Interstial ads opening on two triggers, one is timer & one is when we press back button, only timer is required. 3. Add : Social Buttons under the post title : Fb & twitter, for sharing the articles and if possible then for Likes also 4. Add : In App Purchase to remove/disable adds ( in existing app there is boolean variable already available to make ads enable or disable in backend code) 5. Add : Paypal Donate option (for this if you have already done any previous work, show me the example demo for my understanding) I have a full working source code of my app. Please check my app in playstore, Note : check only [login to view URL] package Note : my website is Wordpress based, and using JSON API, data is loading into the app. Android App Project in Android Studio, using SDK 25.0 version Please ask me if you have any other quires. Thanks San