A: Certainly! If Tidycal supports webhooks, you can integrate it directly with the SendApp Cloud API to send reminders of appointments through WhatsApp. SendApp Cloud provides a comprehensive WhatsApp API that allows you to send messages, including appointment reminders, programmatically.

You can find more information about the SendApp Cloud WhatsApp API and its integration options at https://sendapp.live/en/whatsapp-api/. The documentation provided there will guide you on how to use the API effectively.

Alternatively, if you prefer to automate appointment reminders using Google Script, you can also leverage SendApp Cloud's capabilities. SendApp Cloud provides a guide on how to send WhatsApp notifications with Google Sheets using Google Script. You can find the guide at https://sendapp.live/en/send-whatsapp-notifications-with-the-google-sheet/. This approach allows you to manage your appointments in Google Sheets and send WhatsApp reminders using Google Script and SendApp Cloud.

Please note that Tidycal's webhook integration and specific capabilities would need to be confirmed from Tidycal's documentation or support resources. Once you have confirmed Tidycal's webhook support, you can proceed with integrating it with SendApp Cloud's WhatsApp API or using Google Script with SendApp Cloud, depending on your preferred approach.