Webhook POST format

Is there any way to see what my webhook page returns? It’s in PHP, so I need to grab $_POST variables.

What is the POST variable being sent? $_POST[“what-goes-here”] ?

Pardon the PHP chicken scratch but I’m basically running:

foreach ($_POST as $name => $val) { (sql-insert $name $val to a table) }

And I’m still not getting any data received to the table. What am I doing wrong?

I can elaborate if need be.