@type t() :: %Notifique.OpenApi.Model.NtfContactCampaignRunPreviewResponseData{
  audienceCount: integer() | nil,
  channels: [String.t()] | nil,
  lastRun: map() | nil,
  newInAudience: integer() | nil,
  totalEstimatedCredits: integer() | nil,
  uniqueRecipients: integer() | nil,
  warnings: [String.t()] | nil
}