Privacy Postback - Receiving Conversions Without a Click ID

With Apple's App Tracking Transparency (ATT) framework introduced in iOS 14, passing user-level identifiers like click IDs, IP addresses, and device IDs in postbacks is no longer feasible for opted-out users.

Traditional conversion tracking relies on a click ID being passed from the click all the way through to the conversion postback. This allows platforms like Trackier to match a conversion back to the exact click that triggered it.

With iOS 14 and above, users who opt out of tracking via ATT prevent this click ID from being passed breaking the traditional attribution chain. Since most users choose not to be tracked, this impacts a significant portion of iOS campaign traffic.

To address this, Trackier introduced privacy postbacks a method that uses campaign IDs and publisher IDs instead of click IDs to attribute conversions probabilistically.

This allows you to continue tracking iOS conversions and attributing them to the right publisher and campaign, even without user-level data.

Trackier has introduced a new procedure to address this situation, which allows you to use privacy postbacks to achieve probabilistic attribution and trackable data.

The MMP will no longer be returning click ids, so we will need to use Trackier and their sub-publishers and sub-campaigns to send them publisher and campaign ids from Adnetwork.

Since MMPs (Mobile Measurement Partners) like AppsFlyer can no longer return click IDs for opted-out users, a new parameter is needed to carry the campaign and publisher identification data through the tracking chain.

The parameter used depends on the platform in the chain:

&p8={p8}|{camp_id},{publisher_id}

This passes the publisher's campaign ID and publisher ID through each hop in the redirect chain, allowing each platform to attribute the conversion correctly at their level.

There are two scenarios where your advertiser may be integrated.
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Step 1: Add the parameter to the Campaign URL

Append &af_adset_id={p8}|{camp_id},{publisher_id} to your campaign URL.

Step 2 — Add the parameter to the Publisher Tracking URL

In the publisher's tracking link, append:

&p8={your_campaign_id},{your_sub_publisher_id}

This ensures the campaign and publisher IDs are passed forward to AppsFlyer when the user clicks.

In the postback URL configured on your advertiser's AppsFlyer account, append &p8={af_adset_id} so that AppsFlyer sends the campaign and publisher data back to Trackier on conversion.
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Use this setup when the redirect chain involves multiple publishers and tracking platforms between the end advertiser and the final conversion.

In this scenario, the {p8} macro carries the campaign and publisher IDs of every hop in the chain, building up a pipe-separated string of IDs that gets passed all the way to the advertiser.

Add the following structure to your tracking link:

Parameter breakdown:

Pass your campaign ID, publisher ID, and all sub-source IDs accumulated in {p8} to your advertiser via the privacy postback:

​Clicks flow:

​Conversions flow:

Privacy postbacks allow you to maintain meaningful iOS campaign attribution even when click IDs are unavailable due to ATT opt-outs.

By passing campaign and publisher IDs through the p8 parameter at every hop in the redirect chain, Trackier can probabilistically attribute conversions back to the correct publisher and campaign preserving your reporting integrity in a privacy-first environment.

For related setup guides, refer to:

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