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Besides populating a 3rd party pixel you can also send and store a custom attribute for this user in the DMP. As an example you can decide to add the label "male" in case a user visits a given webpage relevant to men. The latter should be specified within the Segment or Conversion configuration. Based on the principles as documented in the Trigger External Pixels entry you can use the following template:
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This feature can also be used to trigger a predefined webhook with either the DMP or another API-based system. More information about the DMP webhooks can be found here. An An example of an external webhook can be found below. It illustrates how a given "Product ID" can be send to an external system after the user clicked on the product image.
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