Update android app: code from codecanyon, wowonder

I have purchased source code from CodeCanyon:
https://codecanyon.net/item/wowonder-combined-chat-timeline-and-news-feed-application-for-wowonder-php-script/27635728

I would like you to make minor changes, such as changing the theme color, updating branding, configuring settings, integrating AdMob, and setting up push notifications.

Please bid only if you have experience with these tasks. In your proposal, kindly mention at the top, "I did it before," so that I can easily identify relevant bids and filter out random or automated ones.

I am specifically looking for experts in Android, AdMob, notifications, and those who have previously worked with this code.

Thank you.