> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://help.poptin.com/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# How to intergrate your poptin with Callbox?

We allowed in our script to listen to a popup's view, which means knowing when a popup shows up.

If you work with Callbox and want to display a changing virtual phone number in their poptin, you should add this code to their website:

```javascript
function poptinVisible(poptin_id){    __ctm.main.runNow();
}
```