@type t() :: %PolarExpress.Schemas.BenefitLicenseKeysProperties{
  activations:
    PolarExpress.Schemas.BenefitLicenseKeyActivationProperties.t() | nil,
  expires: PolarExpress.Schemas.BenefitLicenseKeyExpirationProperties.t() | nil,
  limit_usage: integer() | nil,
  prefix: String.t() | nil
}