OIDC Authorization - Bad Request - PHP

API
3

Side note: you may want to change to using cURL here.

On most production boxes file_get_contents cannot perform http requests.

Heres a rough cURL example

<?php

if ($_GET['code']) {
    $token_url = 'https://api.twitch.tv/api/oauth2/token';
    $data = array(
        'client_id' => $client_id,
        'client_secret' => $client_secret,
        'grant_type' => 'authorization_code',
        'redirect_uri' => $redirect_uri,
        'code' => $_GET['code']
    );

    $curl = curl_init($token_url);
    curl_setopt($curl, CURLOPT_POST, true);
    curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);

    $result = curl_exec($curl);
    $i = curl_getinfo($curl);
    curl_close($curl);

    if ($i['http_code'] == 200) {
        $result = json_decode($result, true);

    }
}