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

# Destinations and messages

> Accepted number formats, message language, and autofill-ready SMS.

## Accepted formats

Tawked verifies Saudi mobile numbers only. Send `to` in any of these forms; it is stored and echoed back as E.164.

| Example          | Format                  |
| ---------------- | ----------------------- |
| `+966512345678`  | E.164 (canonical)       |
| `966512345678`   | Country code, no plus   |
| `00966512345678` | 00 international prefix |
| `0512345678`     | Local, with leading 0   |
| `512345678`      | Local, no leading 0     |

Anything else answers `422 invalid_destination`. The deprecated field `phone` is still accepted as an alias for `to`, and `to` wins when both are present.

## Language

`lang` picks the message language. Only the literal value `en` selects English; anything else, including a missing field, means Arabic.

## Sender identity

The sender name and the message wording come from your reviewed application, never from the request. That is what the review is for: the person receiving the code sees your brand, and nobody can send under it with a stray key.

## Autofill-ready SMS

Phones can read a code straight out of the SMS when the message ends with the right lines. Tawked adds them for you, after the human-readable text:

```
Your Flower Shop verification code is: 482913
FA+9qCX9VSu
@shop.example.com #482913
```

* **`@domain #code`**, the last line, is what iOS AutoFill and the WebOTP API read. The domain is derived from your application's reviewed website and is read-only; switch the line on or off per application.
* **The app hash line** is for Google's SMS Retriever on Android. Set the 11-character hash per application.
* The optional `autofill` field on `start` (`web`, `android` or `none`) picks which lines go out on that one send. Omit it to send every line the application has configured.

<Warning>
  The whole message must stay under 140 bytes for Android's SMS Retriever, and Arabic SMS is billed per 70-character segment. The domain line adds about 25 characters, which can turn one segment into two. The dashboard preview shows the segment count.
</Warning>

Autofill lines are out of scope for WhatsApp: its message is a fixed Meta template with no room for either.