Compilation failed, how to adapt iOS versions below 14.3

May I ask how to adapt to devices using ADClient under iOS 14.3? xcode version: 16.0 beta (16A5171c) error message：Use of undeclared identifier 'ADClient' if (@available(iOS 14.3, *)) { NSError *error = nil; NSString *token = [AAAttribution attributionTokenWithError:&error]; } else { if ([[ADClient sharedClient] respondsToSelector:@selector(requestAttributionDetailsWithBlock:)]) { [[ADClient sharedClient] requestAttributionDetailsWithBlock:^(NSDictionary<NSString *, NSObject *> * _Nullable attributionDetails, NSError * _Nullable error) { }]; } }

May I ask how to adapt to devices using ADClient under iOS 14.3? xcode version: 16.0 beta (16A5171c) error message：Use of undeclared identifier 'ADClient' if (@available(iOS 14.3, *)) { NSError *error = nil; NSString *token = [AAAttribution attributionTokenWithError:&error]; } else { if ([[ADClient sharedClient] respondsToSelector:@selector(requestAttributionDetailsWithBlock:)]) { [[ADClient sharedClient] requestAttributionDetailsWithBlock:^(NSDictionary<NSString *, NSObject *> * _Nullable attributionDetails, NSError * _Nullable error) { }]; } }