Laravel Developer Needed Ongoing Support

We have an existing Laravel + MySQL web application that provides access to a paid relationship assessment.

The system is already built and live. It is hosted on Hostinger and access is integrated into our website which is Wordpress. The original developer is no longer available and cannot help with Knowledge Transfer. The original cost for development of the entire application was $400

We are not looking for a rebuild, but for a developer who can:

Take over support and change requests
Understand an existing codebase without hand-holding
Make small, well-scoped enhancements

The application:

Built in Laravel
Uses MySQL
Hosted on Hostinger
Integrated with Kajabi (purchase triggers account creation)
Sends automated emails (reminders + assessment report) using Zoho
Front-end website is WordPress (no WordPress dev required)

Immediate task

The first paid task that I am looking for quotes for is simply:
Review the existing Laravel codebase
Understand how Kajabi purchases trigger account creation
Understand the email logic and assessment flow
Confirm how a second product type can be added

This initial task should result in:

A short written summary of how the system works, how it's built, structured, technology being used, how the parts integrate
A clear estimate for implementing the next change

Upcoming change request

We want to add a second product on our website
Same assessment
Includes 60 minutes of coaching
Different email sequence and texts after purchase
Different text in generated assessment report
Account flagged as “Assessment + Coaching”

Required skills

Strong experience with Laravel
MySQL
Experience working with existing/legacy code
Comfortable with webhook-based integrations (Kajabi or similar)
Clear written communication in English
Ability to explain technical concepts to non-technical clients

Nice to have

Experience with Kajabi
Email automation / transactional email experience
WordPress familiarity (not essential)

I need your best fixed price quote for the first piece of work (taking over the codebase and writing up a report of how it works) along with giving a quote for the change request itself (which I expect once the code is understood, should be a matter of 3-4 hours of work but that is for you to validate).