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What characters can be used for campaign parameters?

It is strongly recommended to use the following characters.
  • Uppercase and lowercase letters
  • Numbers
  • _and -
For custom channels, it is strongly recommended to use the following characters.
  • Lowercase letters
  • Numbers
  • _

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Are there length limitations for campaign parameters?

Yes, 256 characters per campaign parameter.

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The campaign parameter is different from what I created.

  • Any /in channel names are replaced by_(e.g. My/Channel→ My_Channel)
  • Any #in the campaign parameter values are replaced by _. (e.g. ad_group=#MyGroup→ ad_group=_MyGroup)

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Why do I see a $$default$$ channel in my reports?

Airbridge tracking links follows a https://abr.ge/@{app_name}/{channel}?{campaign_parameter} format. If channel is empty when the tracking link is clicked, $$default$$ is shown as its value.e.g. Campaign parameter data collected when clicking on https://abr.ge/@airbridge_demo?campaign=abc.
  • channel: $$default$$
  • campaign:abc
As of September 9, 2026, Airbridge no longer collects clicks on tracking links without a channel parameter value as touchpoints. As a result, no new conversions are attributed to the $$default$$ channel. These tracking links continue to redirect users as usual. You can still view conversions attributed through September 8, 2026.
Yes, it is possible for both web and app events. Please see below for details.