@type t() :: %PolarExpress.Schemas.CustomerBenefitGrantCustom{
  benefit: PolarExpress.Schemas.BenefitCustomSubscriber.t() | nil,
  benefit_id: String.t() | nil,
  created_at: DateTime.t() | nil,
  customer: PolarExpress.Schemas.CustomerPortalCustomer.t() | nil,
  customer_id: String.t() | nil,
  error: PolarExpress.Schemas.BenefitGrantError.t() | nil,
  granted_at: DateTime.t() | nil,
  id: String.t() | nil,
  is_granted: boolean() | nil,
  is_revoked: boolean() | nil,
  member_id: String.t() | nil,
  modified_at: DateTime.t() | nil,
  order_id: String.t() | nil,
  properties: PolarExpress.Schemas.BenefitGrantCustomProperties.t() | nil,
  revoked_at: DateTime.t() | nil,
  subscription_id: String.t() | nil
}