Refine the essence of "Courses" - Laravel

Hello!
We are developing an application for learning English.Interaction with lessons occurs with the help of courses. Everything is as usual: viewing, buying, switching to lessons through courses.But now you need to refine them, redo the way you buy courses, add information to the courses themselves, and debug and refactor the current functionality. I will discuss the details with the candidate.
Beck is written in Laravel. We only use it for the REST API. You dont need to make up anything.
You will need to: independently perform the tasks, debug the work of the already written code and yours, provide documentation for the swagger (supplement the existing one). If the rules of responses allow, then I ask you to leave your telegram (so communication will be faster). There are also a few other tasks for this and another project. It will be possible to continue cooperation in the future