First of all, its really awesome post, very detail.

Thank you! I do not have any experience with Parse yet. However I have read some posts about it. It looks like you should use the IOS Api because of its native functionality. You can use my post to get push notifications working in your React-Native project. After you have done this you probably have to connect Parse to you app in some way. I don’t know how you can do this but there are some threads that can help you: