> For the complete documentation index, see [llms.txt](https://docs.smartxaas.io/cpidroid/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.smartxaas.io/cpidroid/advertiser/advertise/tracking/list-of-macros-placeholders-available-apart-from-click_id.md).

# List of Macros / Placeholders available apart from {click\_id}

We are able to pass some additional macros/placeholders apart from **{click\_id}** which can be replaced with corresponding values and passed via tracking or redirect link.

We currently support only two additional macros that we populate on click-out:

* **{gaid}** - google advertising id
* **{idfa}** - apple advertising id
* **{pub\_id}** - first level publisher id
* **{sub\_id}** - second level publisher id (if available)

**Example:** *<https://example.com/tracking.php?campaign\\_id=XXXX\\&click\\_id=><mark style="color:red;">**{click\_id}**</mark>\&gaid=<mark style="color:red;background-color:red;">**{gaid}**</mark>\&pub\_id=<mark style="color:red;">**{pub\_id}**</mark>\&sub\_id=<mark style="color:red;">**{sub\_id}**</mark>*

You can use those to assign installs / in-app activity to specific publishers or sub-publishers and thus optimize campaign performance over time by eventually blacklisting non-performing sources.