php discogs API auth flow - php

Question

I'm trying to use the discogs php api in a PHP script to get info on a release using the release ID. For example, when I make a request to:
http://mywebsite.com/test.php?id=1017868
I want to call the discogs API to get info on the release with id = 1017868. I can see the info I want by manually going to:
https://api.discogs.com/releases/1017868
So I have my $consumerKey =and $consumerSecret and I'm following the DISCOGS AUTH FLOW instructions, which says I can send my keys in a get request like so:
curl "https://api.discogs.com/database/search?q=Nirvana" -H "Authorization: Discogs key=foo123, secret=bar456"
I'm trying to make a get request for my target id in my php script like so:
<?php
echo "hello world <br>";
//discogs simple auth flow, http requests
$remote_url = 'https://api.discogs.com/releases/1017868';
// Create a stream
$opts = array(
'http'=>array(
'method'=>"GET",
'header' => "Authorization: Discogs key=mykeyasdlkhaskld, secret=mysecretkeykjnasdkjnsadkj"
)
);
$context = stream_context_create($opts);
// Open the file using the HTTP headers set above
$file = file_get_contents($remote_url, false, $context);
print($file);
echo "end of program";
?>
But I keep getting the error:
"failed to open stream: HTTP request failed! HTTP/1.1 403 Forbidden".
Is there something I'm forgetting for making my request to the server? Thanks.