How to check received data via POST?

Question

PHP

Hey!
The site has a payment method.
After payment, the bank sends a notification via POST to file.php
*any echo and print will be seen by the bank, because it sends this data. I don't see echo and print

How can I find out what data was received via POST ?
And were they received or not?

What do you usually use for test reception and analysis of POST data?

Answer 1

> What do you usually use for test reception and analysis of POST data?
I usually use PHP