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# System prepended metadata

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## Callout banner

A callout banner allows you to add a banner to the chatbot's conversation. It can be used to alert the users about new products, services, special offers, and promotions. 

When multiple banners are configured for a chatbot, the banners are automatically scrolled every five seconds. On enabling this option, the close button gets replaced by the minimize button.

:::note
* You cannot add images or videos to the callout banner.
:::

<img src="https://i.imgur.com/KT7cd0U.png" alt="drawing" width="60%"/>


Limitations:
* Each callout banner supports two buttons with up to 24 characters each.
* The callout banner supports 200 characters in the title.



## How to pass payload data for PWA bot

[You can pass the data for the pwa](https://cloud.yellow.ai/liveBot/x<bot_id>?ym.payload={%22name%22:%22sakshi%22})

You can fetch the user's chat history from a PWA bot by passing the ymAuthentication token.

To pass payload datan for a PWA bot, follow these steps:

1. Use this `https://cloud.yellow.ai/pwa/v2/live/x1657623696077` URL.  

2. In the address bar, append `?ym.payload={%22name%22:%22sakshi%22}'. 
   For example, `https://cloud.yellow.ai/pwa/v2/live/x1657623696077?ymAuthenticationToken=12345`
   
   ![](https://i.imgur.com/74H5PE5.png)
   kTfGrLNn.png 
 



    
