add to feature to existing Project

I need help adding a feature to my existing project. Specifically, I am looking for help to create a Database Schema. I already have the schema in place, but I need help with requirements for the new feature that I am adding. With the help of a freelancer, I am confident that this project can be complete to the highest standards.

Project is Based on PHP With Laravel Framework and mobile APps on Flutter

need to add more OPtion in Cupon section
like Free delivery , 1st order cupon , store wise cupon

i can provide you with sample data and how the function works