> For the complete documentation index, see [llms.txt](https://helpdocs.ycloud.com/help-center/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://helpdocs.ycloud.com/help-center/whatsapp-basics/message-templates/authentication-message-templates/one-click-autofill-authentication-template.md).

# One-Click Autofill Authentication Template

The One-Tap Auto-Fill Authentication Template allows you to send a verification code along with a one-tap auto-fill button to users. When the user clicks the auto-fill button, WhatsApp will trigger an activity that opens your app and sends it the password or code.

<figure><img src="/files/YN6KNPuPAJDeRAuccg5u" alt="" width="563"><figcaption></figcaption></figure>

The One-Tap Auto-Fill Button Authentication Template includes:

* Pre-set text: *\<VERIFICATION\_CODE> is your verification code.*
* Optional security disclaimer: *For your safety, do not share this code.*
* Optional expiration warning (optional): *This code will expire in \<NUM\_MINUTES> minutes.*
* One-tap auto-fill button.
* Message validity: If the message is not delivered within the valid period, you will not be charged, and your customer will not see the message.

#### Limitations <a href="#limitations" id="limitations"></a>

The one-tap auto-fill button is only supported on Android. If you send an authentication template to a WhatsApp user with a non-Android device, WhatsApp will display a copy code button.

URLs, media, and emojis are not supported.


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