freemius-webhook.php

<?php
    /**
     * Super-simple webhook example that does two things:
     *      1. Subscribes new plugin users to MailChimp's mailing list.
     *      2. Send post uninstall custom email to users based on different uninstall reasons.
     *
     * @copyright   Copyright (c) 2016, Freemius, Inc.
     * @license     http://opensource.org/licenses/gpl-2.0.php GNU Public License
     * @since       1.0.3
     */

    // Retrieve the request's body.
    $input = @file_get_contents("php://input");

    // Verify the authenticity of the request.
    $hash = hash_hmac('sha256', $input, 'YOUR_PLUGIN_SECRET_KEY');

    $signature = $_SERVER['HTTP_X_SIGNATURE'] ?? '';

    if ( ! hash_equals($hash, $signature))
    {
        // Invalid signature, don't expose any data to attackers.
        http_response_code(200);
        exit;
    }

    // Decode the request.
    $fs_event = json_decode($input);

    /**
     * Freemius PHP SDK can be downloaded from GitHub:
     *  https://github.com/Freemius/php-sdk
     */
    require_once '/path/to/freemius/sdk/Freemius.php';

    $fs = new Freemius_Api(
        'plugin',
        'YOUR_PLUGIN_ID',
        'YOUR_PLUGIN_PUBLIC_KEY',
        'YOUR_PLUGIN_SECRET_KEY'
    );

    switch ($fs_event->type)
    {
        case 'install.installed':
            $user  = $fs_event->objects->user;
            $email = $user->email;
            $first = $user->first;
            $last  = $user->last;

            /**
             * MailChimp SDK for API v3  can be downloaded from here:
             *  https://github.com/drewm/mailchimp-api
             */
            require_once '/path/to/mailchimp-api/api-v3/MailChimp.php';

            // Subscribe to mailchimp list.
            $blog_subscribers_list = 'LIST_ID';
            $mc                    = new MailChimp('API_KEY');
            $result                = $mc->post("lists/{$blog_subscribers_list}/members", array(
                'email_address' => $email,
                'status'        => 'subscribed',
                'merge_fields'  => array(
                    'FNAME' => $first,
                    'LNAME' => $last
                ),
            ));

            break;
        case 'install.uninstalled':
            $user  = $fs_event->objects->user;
            $email = $user->email;
            $first = $user->first;
            $last  = $user->last;

            $fs_uninstall = $fs->Api("/installs/{$fs_event->objects->install->id}/uninstall.json");

            // Send email with your favorite service (we use SendGrid).
            define('FS__UNINSTALL_REASON_NO_LONGER_NEEDED', 1);
            define('FS__UNINSTALL_REASON_FOUND_BETTER_PLUGIN', 2);
            define('FS__UNINSTALL_REASON_USED_FOR_SHORT_PERIOD', 3);
            define('FS__UNINSTALL_REASON_BROKE_WEBSITE', 4);
            define('FS__UNINSTALL_REASON_STOPPED_WORKING', 5);
            define('FS__UNINSTALL_REASON_CANT_CONTINUE_PAYING', 6);
            define('FS__UNINSTALL_REASON_OTHER', 7);
            define('FS__UNINSTALL_REASON_DID_NOT_WORK_ANONYMOUS', 8);
            define('FS__UNINSTALL_REASON_DONT_LIKE_INFO_SHARE', 9);
            define('FS__UNINSTALL_REASON_UNCLEAR_HOW_WORKS', 10);
            define('FS__UNINSTALL_REASON_MISSING_FEATURE', 11);
            define('FS__UNINSTALL_REASON_DID_NOT_WORK', 12);
            define('FS__UNINSTALL_REASON_EXPECTED_SOMETHING_ELSE', 13);
            define('FS__UNINSTALL_REASON_EXPECTED_TO_WORK_DIFFERENTLY', 14);

            switch ($fs_uninstall->reason_id)
            {
                case FS__UNINSTALL_REASON_NO_LONGER_NEEDED:
                    // Send email.
                    break;
                case FS__UNINSTALL_REASON_STOPPED_WORKING:
                    // Send email.
                    break;
                default:
                    // Send email.
                    break;
            }

            break;
    }

    http_response_code(200);