A Wordpress X ReactNative challenge

I've got a friend who runs a web agency and has a client who wanted their wordpress website turned into an app.

So my friend enlisted the help of a developer who had experience in React native app development but not so much in wordpress. The project was fine until they reached a block.

Challenge:

Here is where the problem is. The developer is having issues with the WP Rest Api. He can't seem to figure out why the posts published on wordpress are not showing on the application.

My friend is currently on the look out for some help. I thought I'd post this here in hopes of seeing someone with enough experience and time to take on this (paid) challenge.

Please drop me a message for details.