M2E sycn & Debug/Test (Xdebug/Local enviroment) [closed]

Question

I need to debug the process that sync data from Magento to Ebay/Amazon in order to do some customization in the code.

In particular the aim is to change the way shipping tax are calculated in the imported order anyway the main point here is how to debug/trace the entire process and found code entry point.

There is already a similar question but doesn't contains the info that I need, any way it has some info you may be interested to understand better the scenario in case you are facing a similar challenge : How to test/debug Ess_M2ePro Amazon integration?

So question is how can I trace the process using Xdebug on my local environment ?