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User Properties are key-value pairs attached to a user. They are used for segmentation, analytics filtering, and powering third-party integrations (e.g., sending user emails to Mailchimp or attribution IDs to AppsFlyer).

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Defined vs Custom properties

  • Defined properties — Qonversion-reserved keys prefixed with _q_ (e.g., _q_email, _q_appsflyer_user_id). These power built-in integrations.
  • Custom properties — Any key you define for your own segmentation needs.
See the full list of defined properties in the User Properties guide.

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User Property object

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Available endpoints

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Authentication

All User Properties endpoints require a Project Key in the Authorization header.