> ## Documentation Index
> Fetch the complete documentation index at: https://docs.lekalao.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Triggers

> What brings a subscriber into an automation.

The trigger is chosen when you create the automation and changed in **Settings → What starts it**. In every case, the person must be **subscribed** (not unconfirmed, not unsubscribed) on the automation's list, and inside its segment when it has one.

## Someone subscribes to the list

Every new **confirmed** subscriber comes in: straight away on a list without double opt-in, at the click on the confirmation link otherwise. Whatever they came from: a form, an import, the API, or being added by hand.

It is the trigger of welcome series.

## A tag is added

The subscriber comes in as soon as the chosen tag is put on them, by anyone: the team, an import, the API, another automation, or the subscriber themselves on their preferences page. **Any tag** sets it off on every tag added.

> Your shop adds the `abandoned-basket` tag through the API; the automation sends a reminder two hours later, unless the "buys something" goal is reached in the meantime.

## A tag is removed

The same, when the tag is taken off.

## A date of the subscriber comes round

Checked every day. Settings:

<ParamField path="Date attribute" type="attribute name" required>
  The custom attribute that holds the date: `birth_date`, `joined_on`. Write
  the dates as `YYYY-MM-DD` (`1990-11-01`) to leave no doubt between day and
  month. Only the day and the month count.
</ParamField>

<ParamField path="Days before" type="0 to 365" default="0">
  Come in a few days before the date. 0 means the day itself.
</ParamField>

The subscriber comes in once a day at most, so once a year for a birthday.

## A webhook is called

Your application sends an e-mail address to the automation's **address**, shown with a **Copy** button:

```bash theme={null}
curl -X POST "https://lekalao.example.com/webhooks/automations/9d5c2a1e-…?secret=Kx8…" \
  -H "Content-Type: application/json" \
  -d '{"email": "ada@example.com", "first_name": "Ada"}'
```

The person is subscribed to the list if they are not on it (without confirmation), then enters the journey; the first actions run at once. The address holds a secret: treat it like a password.

<Tip>
  From a server, prefer the API with its token, which works with **any**
  trigger: see [Automations through the
  API](/developers/automations).
</Tip>

## Nothing: subscribers are added by hand

Nobody comes in on their own. You pick who does, from the **Subscribers → Add subscribers** tab, or your application brings them in through the API.