C:/xampp/htdocs/moodle/enrol/paypal/return.php

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<?php

// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

require("../../config.php");
require_once("$CFG->dirroot/enrol/paypal/lib.php");

$id = required_param('id', PARAM_INT);

if (!$course = $DB->get_record("course", array("id"=>$id))) {
    redirect($CFG->wwwroot);
}

$context = get_context_instance(CONTEXT_COURSE, $course->id, MUST_EXIST);

require_login();

if ($SESSION->wantsurl) {
    $destination = $SESSION->wantsurl;
    unset($SESSION->wantsurl);
} else {
    $destination = "$CFG->wwwroot/course/view.php?id=$course->id";
}

$fullname = format_string($course->fullname, true, array('context' => $context));

if (is_enrolled($context, NULL, '', true)) { // TODO: use real paypal check
    redirect($destination, get_string('paymentthanks', '', $fullname));

} else {   
    $PAGE->set_url($destination);
    echo $OUTPUT->header();
    $a = new stdClass();
    $a->teacher = get_string('defaultcourseteacher');
    $a->fullname = $fullname;
    notice(get_string('paymentsorry', '', $a), $destination);
}