Adding couple of features to existing android app

I have one wallpaper application for android, in which I want to add couple of features. 1 - Favorite option as in this app [login to view URL] 2 - Currently the notification are being sent from parse, I want to send notification from my Admin Panel (done in php) 3 - Very minute changes like replacing existing icons. (5-10 at max). Please place your bid keeping in mind the task you're required to do. I got this app developed for 8000 INR, so place your bid accordingly. You have to finish this task in 3-4 days. You'll be provided the existing source code, but you have to destroy that as soon as the project is completed. You'll not be using the source in your other projects or re-selling it.