@type t() :: %PolarExpress.Schemas.BenefitCustomSubscriber{
  created_at: DateTime.t() | nil,
  deletable: boolean() | nil,
  description: String.t() | nil,
  id: String.t() | nil,
  metadata: PolarExpress.Schemas.MetadataOutputType.t() | nil,
  modified_at: DateTime.t() | nil,
  organization: PolarExpress.Schemas.BenefitSubscriberOrganization.t() | nil,
  organization_id: String.t() | nil,
  properties: PolarExpress.Schemas.BenefitCustomSubscriberProperties.t() | nil,
  selectable: boolean() | nil,
  type: String.t() | nil
}