---
language: en
title: Event with double opt-in
category: Flows
summary: Learn how to assign events to a double opt-in process, add the confirmation link to your template and remove double opt-in again.
---

# Event with double opt-in

The scheduling tool TuCalendi lets you confirm appointments and emails via **double opt-in**.

## What is a double opt-in?

With our **Double Opt-In** option, you can have your appointments/meetings confirmed again by the customer. Once a customer/participant has booked an appointment, they must click a link in the **confirmation email** they receive to reconfirm their email and meeting. If this does not happen, the booking will be **deleted after 2 hours** and the **time slot** will be released again. If the customer confirms, the appointment is finally booked.

## Why a double opt-in?

The double opt-in procedure is primarily intended to provide **protection against spam** and to make sending commercial or unsolicited emails (follow-ups), especially in EU countries, legally secure and **GDPR-compliant**. **According to the GDPR, appointment confirmations and reminders do NOT require a double opt-in procedure, but no advertising or commercial benefit may be visible in these emails**. As soon as a **follow-up email** with commercial benefit is sent to the customer, the customer must first go through the double opt-in process and thus give their **consent** to receive further emails.

## Assign an event with double opt-in

Assigning an event to a double opt-in process is very simple. To do this, click on **Flows** in the menu and then select **"Double Opt-In"**.

![Select double Opt-In](https://www.tucalendi.com/images/content/flows/en/select-double-opt-in.png)

After you have done this, click on **"Assign meeting types/events"**.

![Assign events with double opt-In](https://www.tucalendi.com/images/content/flows/en/assign-event-to-double-opt-in.png)

Then choose the event(s) you want to assign to the double opt-in process.

![Choose events](https://www.tucalendi.com/images/content/flows/en/select-events-for-double-opt-in.png)

You can select one or more events. Once you have selected the events you want to assign, click on **"Save"**. The event(s) will then be assigned to the double opt-in process. The next step is to add the **double opt-in link** to the [confirmation template](https://www.tucalendi.com/en/s/email-notifications/setting-up-confirmation-templates).

> [!CAUTION]
> **VERY IMPORTANT:** If you assign an event with a double opt-in procedure but the confirmation template does not contain a double opt-in link, the customer cannot confirm the meeting/appointment, the booking is **automatically deleted after 2 hours** and the time slot is released again.

## Integrate the double opt-in link in the confirmation template

In principle, you can integrate the double opt-in link into any **confirmation template**. As soon as an event without an assigned double opt-in process uses a confirmation template with double opt-in, this area is **automatically removed**. This way, you don't have to worry about the customer receiving a confirmation link even though they don't need to confirm the meeting/appointment.

The area for the procedure is marked in the confirmation template with **[DoubleOptIn] ... [/DoubleOptIn]** and the tag for the link is **{double_optin_link}**.

Here is an example:

![Example double opt-In link](https://www.tucalendi.com/images/content/flows/en/example-double-opt-in-link.png)

> [!CAUTION]
> **VERY IMPORTANT:** Don't forget the tag **{double_optin_link}**, otherwise no confirmation link will be created and the customer will not be able to confirm the meeting/appointment.

## Remove double opt-in from an event

You can **remove the double opt-in** procedure from an event at any time. To do this, go to the double opt-in settings as described under "Assign an event with double opt-in" and click on **"remove"** for the events that should no longer have a double opt-in. Then click on **"Confirm"** and the events will be removed from the double opt-in.

![Remove double opt-in from event](https://www.tucalendi.com/images/content/flows/en/remove-double-opt-in-from-event.png)

> [!NOTE]
> **Please note:** Bookings made with a double opt-in process that are not confirmed will be **automatically deleted after 2 hours**.