PHP + JavaScript + cURL - to build Facebook API integrations

I have a few very specific code snippets I need to get developed with PHP, JavaScript, cURL & JSON. I've done a lot of the work on this, but just need someone who is an ABSOLUTE ACE with Facebook Marketing API code implementation and PHP + JavaScript to help me troubleshoot and debug the code.

One example is a script to interface with the Facebook API and send specific server-side events.

This will be just a few hours of work (5-10 hours) at a time, and will need to be done on a LIVE SCREEN-SHARING session with me.

VERY IMPORTANT: Due to the extremely sensitive nature of the work, NO direct access to the code or systems will be provided... the expert will only be able to view the code via the shared screen session on Teams / Skype, and will need to walk me through the changes needed to get the code working. So think of it almost as a session where you're consulting me on how to improve and trouble-shoot code, without having to write any code yourself.

The person needs to speak perfect English and cannot be an intermediary - I have to speak directly to the expert, and the person needs to be extremely familiar with Facebook's Marketing API.