Hey @mdsmith1!
If your appointment data is in a database, the simplest way is to schedule a daily Workflow (e.g., every morning) that checks for appointments happening tomorrow and sends reminders via email or SMS.
You only need webhooks if you want to trigger a Workflow automatically when something happens in another system, like when a new appointment is booked.
For example, your booking tool could send a signal (a webhook) to Retool the moment someone schedules, and Retool can act on it right away (like saving it to a database or sending a confirmation).
Hey @mdsmith1, thanks for reaching out about Workflows! And thank you @Spacebar for the great answer. Here's our doc on triggering Workflows with webhooks. Hope it's helpful if you decide to explore this in the future!