API Documentation: A document that outlines all the endpoints, requests and responses of the API.

Codebase: A copy of the source code for the backend application along with any configuration files and necessary dependencies.

Database Schema and Data: A document that describes the structure of the database and any data required to run the backend application.

Test Cases: A set of unit, integration and end-to-end tests that verify the correctness and functionality of the backend application.

Deployment Instructions: A document that provides clear instructions on how to deploy the backend application to a production environment.

Maintenance and Support Plan: A document outlining the scope of maintenance and support services provided by the development team, such as bug fixes, upgrades and technical support.

User Manual: A document or online resource that explains how to use the backend application.