statuspage.io webhooks to discord

webhook.php

<?php

$KEY = ''; // option key to prevent unauthenticated password, should be transfered as the get parameter "key"
$DISCORD_WEBHOOK_URL = ''; // the discord webhook

if ($_SERVER['REQUEST_METHOD'] != 'POST') {
    header('HTTP/1.0 405 Method Not Allowed');
    echo "Only POST requests allowed\n";
    exit();
}

if ($_SERVER['CONTENT_TYPE'] != 'application/json') {
    header('HTTP/1.0 415 Unsupported Media Type');
    echo "I only accept application/json data\n";
    exit();
}

if ($KEY != '') {
    if (!array_key_exists('key', $_GET)) {
        header('HTTP/1.0 401 Unauthorized');
        exit();
    }
    if ($_GET['key'] != $KEY) {
        header('HTTP/1.0 401 Unauthorized');
        exit();
    }
}

$data = json_decode(file_get_contents('php://input'), true);

if (!array_key_exists('incident', $data)) {
    exit();
}

$payload = array(
    'embeds' => array(
        array(
            'title' => 'Status Update: ' . ucfirst($data['incident']['status']) . ' ' . $data['incident']['name'],
            'url' => $data['incident']['shortlink'],
            'timestmap' => $data['incident']['updated_at']
        )
    )
);

if (count($data['incident']['incident_updates']) >= 1) {
    $payload['embeds'][0]['description'] = $data['incident']['incident_updates'][0]['body'];
}

$context = stream_context_create(array(
  'http' => array(
    'method' => 'POST',
    'header' => 'Content-Type: application/json',
    'content' => json_encode($payload)
  )
));

$response = file_get_contents($DISCORD_WEBHOOK_URL, false, $context);

How do you make it post?