Hi,
using Google Calendar is free. Here are the steps how to synchronize reservation with your Google Calendar
Google Settings
1. Create google calendar in your google account, than go at
cloud.google.com and create the project by clicking on CREATE PROJECT. Enter Project name and Project ID.
2. Turn on Calendar API at the APIs & auth/APIs.
3. Create connection to Joomla by using Credentials at the APIs & auth/Credentials
4. Create New Client ID, choose any Name and create Web Application
5. Redirect URL - enter name of your domain
yourdomain/administrator"index.php?...=google.authenticate
6. By clicking on GENERATE you receive Client ID and Client Secret
Booking Settings:
1. Go to Global Configuration - Google and enter Client ID and Client Secret - Save
2. Run Load Calendars on the Control Panel/Google - this function loads calendars created in your google account
3. Now you can choice Default Calendar in Global Configuration
4. To finish synchronization by using Control Panel - Google - Synchronize Events. The reservation will be synchronized into your google calendar.