NS_ERROR_ENUM(FIRAppCheckErrorDomain, FIRAppCheckErrorCode){
    /// An unknown or non-actionable error.
    FIRAppCheckErrorCodeUnknown = 0,

    /// A network connection error.
    FIRAppCheckErrorCodeServerUnreachable = 1,

    /// Invalid configuration error. Currently, an exception is thrown but this error is reserved
    /// for future implementations of invalid configuration detection.
    FIRAppCheckErrorCodeInvalidConfiguration = 2,

    /// System keychain access error. Ensure that the app has proper keychain access.
    FIRAppCheckErrorCodeKeychain = 3,

    /// Selected app attestation provider is not supported on the current platform or OS version.
    FIRAppCheckErrorCodeUnsupported = 4

}