You can only update 3 fields on a campaign once it's been created:

  1. UserGuid - A pass-through field that should tie to a unique user ID in your system
  2. ExpiresAt - The date we will stop recording data on a campaign, note this time is UTC and must be between 1970-01-01T00:00:01 and 2038-01-19T03:14:07.
  3. NeverExpires - If this is set to true, Litmus will never stop recording data and will ignore ExpiresAt.

The response is the campaign in json format with the updated values.

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base64
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