Thunkable Facebook Web Api Component

I’m a beginner in using Web Api Component, I want to create an app that can integrate facebook messages; specifically send and receive facebook messages through that app and I found that Web Api Component is a way to do it and after researching I’m still a bit confuse on how to use it specifically to send and receive message.
I also found that to send a message you’ll need this request URL<PAGE_ACCESS_TOKEN>
but also you need to attach the person’s App ID and message ID and how can I do it? please help me