Gazelle/sections/donate/index.php

<?php
declare(strict_types=1);

$ENV = ENV::go();
if (!$ENV->FEATURE_DONATE) {
    header('Location: index.php');
    error();
}

// Module mini-config
include SERVER_ROOT.'/sections/donate/config.php';

if (!isset($_REQUEST['action'])) {
    include SERVER_ROOT.'/sections/donate/donate.php';
} else {
    switch ($_REQUEST['action']) {
    case 'ipn': // PayPal hits this page when a donation is received
      include SERVER_ROOT.'/sections/donate/ipn.php';
      break;

    case 'complete':
      include SERVER_ROOT.'/sections/donate/complete.php';
      break;
      
    case 'cancel':
      include SERVER_ROOT.'/sections/donate/cancel.php';
      break;
  }
}