> For the complete documentation index, see [llms.txt](https://docs.trackwill.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.trackwill.com/postback-url/postback-url.md).

# Postback URL

**Postback URL** - is used to send conversions to the source or any additional services. You can specify postbacks at the:

* [**Traffic source**](/traffic-sources/adding-an-integrated-traffic-source-in-trackwill.md) creation page. By default, always sends conversions on this postback, regardless of whether other postbacks are specified;
* [**General tab** ](/campaign/campaign-general-tab.md)at the campaign creation page. If it is specified, always sends conversions on this postback, regardless of whether other postbacks are specified;
* [**Advanced settings**](/campaign/advanced-settings.md) at the campaign creation page. By default, these postbacks are working if you configured them instead of postback in the General tab.

***Please note that the tracker with a postback in the traffic source settings sends conversions for all campaigns at once. If you need to send conversions only for a specific campaign, use the S2S postback in its settings.***

***Trackwill postback example:***

```
http://s2s.trwl1.com/api/v1/conversion?clickid={sub1}&payout={sum}&type=join
```


---

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