#import <Foundation/Foundation.h>

typedef void(^IAPCompletionBlock)(BOOL success, NSInteger amount, NSError  * _Nullable error);

@interface IAPManager : NSObject

+ (instancetype _Nonnull )sharedManager;
//- (void)fetchProducts:(nonnull NSArray<NSString *> *)productIds;
- (void)buyProduct:(nonnull NSString *)productId completion:(IAPCompletionBlock _Nullable )completion;
- (void)restorePurchases;
- (void)checkUnfinishedTransactions; // 掉单处理

@end