Unable To Get Twitch API OAuth For PHP In 2022 - php

Question

I have been unable to get an OAuth token. I have spent about 4 hours trying. The various iterations and changes the Twitch API has been through is leaving me unsure and confused. The Twitch Developers now have a message posted stating V5 API being decommission on February 28th 2022. I am lost.
This is where I am at right now. The "code" below is from the Getting authorization code here.
<?php
function file_get_contents_curl($url) {
$curlHeader = [
'client_id' => '"CLIENT ID"',
'client_secret' => '"CLIENT SECRET"',
'code' => '"POST TOKEN"',
'grant_type' => '"AUTHENTICATION CODE"',
'redirect_uri' => 'https://rons-home.net'
];
$ch = curl_init();
curl_setopt($ch, CURLOPT_AUTOREFERER, TRUE);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE);
curl_setopt($ch, CURLOPT_HTTPHEADER, $curlHeader);
$data = curl_exec($ch);
curl_close($ch);
return $data;
}
print_r( file_get_contents_curl( 'https://id.twitch.tv/oauth2/authorize' ) );
Response
{"status":400,"message":"missing response type"}

Answer 1

This is a valid curl call to do the Step 3 of user oAuth
Most notably:
you were trying to pass paramters as a header
And you have extra " littered in your paramerters
And your grant type if very wrong
Substitute the constants as needed.
$ch = curl_init('https://id.twitch.tv/oauth2/token');
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, array(
'client_id' => CLIENT_ID,
'client_secret' => CLIENT_SECRET,
'code' => $_GET['code'],
'grant_type' => 'authorization_code',
'redirect_uri' => REDIRECT_URI
));
// fetch the data
$r = curl_exec($ch);
// get the information about the result
$i = curl_getinfo($ch);
// close the request
curl_close($ch);