How would i see the POST data from a result in Node?

My payment gateway is returning values in POST with some results so i can do the rest of the transaction… But now im bit stuck on this one…
If they returned it as GET… then easy peazy…

Before in PHP i used… and that worked like a charm…
$_POST[‘PAY_REQUEST_ID’]
$_POST[‘TRANSACTION_STATUS’]
$_POST[‘CHECKSUM’]

Can anyone point to me to a page or a topic on this forum?
To get the “POST” values and use them on my page… because im a bit stuck with NodeJs
I have searched the community pages for the last 3 hours… but still stuck… i think i might not look for the correct solution…

what would be the equivalent in NodeJs page to get the POST data so i can use it? As i have done before in PHP…

my brain is now fried…