ios - Payment queue does not call observer object about updated transaction? -

in app when user press buy details , sigin uialertviewcontroller, still set there, payment queue not call observer object updated transaction.

and not print purchased state means didnt worked.

my code written :

in .h file

#import <uikit/uikit.h> #import <storekit/storekit.h>  @interface pbcashviewcontroller : uiviewcontroller<skpaymenttransactionobserver, skproductsrequestdelegate> {  } @property(strong,nonatomic) skproduct *product; @property(strong,nonatomic) nsstring *productid;   @property (strong, nonatomic) iboutlet uilabel *producttitle; @property (strong, nonatomic) iboutlet uitextview *productdescription; @property (strong, nonatomic) iboutlet uibutton *buybutton; - (ibaction)buy:(id)sender;` 

in .m file

    -(void)getpurchaseid {      if ([skpaymentqueue canmakepayments]) {          skproductsrequest *request = [[skproductsrequest alloc] initwithproductidentifiers:[nsset setwithobject:self.productid]];         request.delegate = self;         [request start];      } else {          _productdescription.text = @"please enable in app purchases in settings";      }  }  -(void)productsrequest:(skproductsrequest *)request didreceiveresponse:(skproductsresponse *)response {      nsarray *products = response.products;     if (products.count != 0) {          _product = products[0];         _buybutton.enabled = yes;         _producttitle.text = _product.localizedtitle;         _productdescription.text = _product.localizeddescription;      } else {          _productdescription.text = @"product not found";      }      products = response.invalidproductidentifiers;     (skproduct *product in products) {         nslog(@"product not found: %@", product);     }  }  -(void)paymentqueue:(skpaymentqueue *)queue updatedtransactions:(nsarray<skpaymenttransaction *> *)transactions {      (skpaymenttransaction *transaction in transactions) {          switch (transaction.transactionstate) {             case skpaymenttransactionstatepurchased:                  [self unlockpurchase];                 [[skpaymentqueue defaultqueue] finishtransaction:transaction];                 _producttitle.text = @"the product has been purchased";                   break;              case skpaymenttransactionstatefailed:                  [[skpaymentqueue defaultqueue] finishtransaction:transaction];                 _producttitle.text = @"the product has not been purchased";                   break;             case skpaymenttransactionstaterestored:                  [[skpaymentqueue defaultqueue] finishtransaction:transaction];                 _producttitle.text = @"restored";                   break;              default:                 break;         }      }  }  -(void)unlockpurchase {      nslog(@"successfuly purchased "); } 

please me on anyone.