Integrate firebase auth into an existing WP auth script -- 2

I need a good PHP developer with a range of skills but particularly strong with integrations and building new things using laravel and mysql. This particular task is for a wordpress auth script that is currently authenticating against a Parse backend and now we need to add an auth against Firebase. Basically, the script needs to check if a user is already logged in via their Firebase Auth Key and then authenticate the user in Wordpress. The script already exists and just really needs to have this additional feature added to it. I have other work for you too so please make sure you bid on this project if you're keen on a long term relationship. Now if you're still with me, please make sure you start your response with the word 'harvey' so I know you're really paying attention and this will also help me filter out any auto-bids and.. bots and stuff. Please also make sure you set your project timeline to exactly 4 days which will just help me filter even further. Please do not paste your standard response to this project... standard copy / paste comments of your work and experience will be ignored.. Please just tell me a little about what you think is required for this project and your thoughts around challenges / work involved.. I look forward to working with you on this project and many more to come. Thanks.