Tutorial on Nativescript basic app with PHP backend code

Hi, i'm new to Nativescript and i struggled doing the grocery toturial app and configure it using PHP backend. What i need is someone to do the grocery app toturial and write PHP backend for login, logout, and list retrieval. The code should be commented and clear so i can understand it and complete my development The project source code should be submitted with clear comments explaining the following: -how log in data is sent to the backend, -whats the response of [login to view URL] file should be. -how the app send ajax requests and how to get and pass user information or key with ajax request