@class NSDictionary; @interface AMSUIDDynamicImpressionMetrics : NSObject { void /* unknown type, empty encoding */ custom; void /* unknown type, empty encoding */ fields; } @property (nonatomic, copy) NSDictionary *custom; @property (nonatomic, copy) NSDictionary *fields; @property (nonatomic, retain) void /* unknown type, empty encoding */ identifier; - (id)init; - (void).cxx_destruct; - (id)initWithIdentifier:(id)a0 fields:(id)a1 custom:(id)a2; @end