NS_ENUM(NSInteger, GADAdValuePrecision) {
  /// An ad value with unknown precision.
  GADAdValuePrecisionUnknown = 0,
  /// An ad value estimated from aggregated data.
  GADAdValuePrecisionEstimated = 1,
  /// A publisher-provided ad value, such as manual CPMs in a mediation group.
  GADAdValuePrecisionPublisherProvided = 2,
  /// The precise value paid for this ad.
  GADAdValuePrecisionPrecise = 3
}