How to make a donation in PHP

make-donation.php

<?php
function make_donation() {
    // TODO: Set these values.
    // `amount`       The amount of the donation in cents.
    // `public_key`   Get this from https://api.getchange.io/developers. Test key starts with pk_test, Prod key starts with pk_live.
    // `secret_key`   Get this from https://api.getchange.io/developers. Test key starts with sk_test, Prod key starts with sk_live.
    // `nonprofit_id` Get this from https://api.getchange.io/nonprofits. When you search a nonprofit, you can see its nonprofit_id.
    $amount = 500;
    $public_key = '';
    $secret_key = '';
    $nonprofit_id = '';

    // Prepare the donation
    $url = 'https://api.getchange.io/api/v1/donations';
    $data = array('amount' => $amount, 'nonprofit_id' => $nonprofit_id, 'funds_collected' => false);
    $options = array(
        'http' => array(
            'header'  => array("Content-type: application/json", "Authorization: Basic " . base64_encode($public_key . ":" . $secret_key)),
            'method'  => 'POST',
            'content' => json_encode($data)
        )
    );

    // Send the donation.
    $context = stream_context_create($options);
    $result = file_get_contents($url, false, $context);

    // You can inspect the response to make sure it succeeded.
    $donation_id = json_decode($result, true)['id'];
}
?>