Need help figuring out how our API works (PHP & React Native) ($50)

We invested in a platform from Codecanyon : [login to view URL] It's essentially a Grubhub or UberEats type of platform that has multiple restaurants to order food from. We're integrating some new features in the React Native mobile application and need someone to help figure out how the endpoint works to pull the data and use for the changes.. This is backend work for someone who is experienced in React Native and PHP.