Mobile Software Engineer Needed to Help Modify and Post App to China's Local App Store

I have an Android App with In-App purchase. I would like to post it to China's Local App stores. I need a software engineer who has experience to integrate local in-app purchase into my app. Make sure it can be published successfully.

Here is the requirement:
1. You are located in China.
2. You are familiar with the in-app purchase/subscription APIs between different app stores.
3. You are familiar with ad usage in the app.
4. Big Plus if you are also familiar with backend work.