The below Code works fine for android as expected but for ios it doesn't work i tried to manage it ComponentDidUpdate but there it gets called multiple times.

componentDidMount() {
     BackHandler.addEventListener('hardwareBackPress', () => {
     BackHandler.exitApp();
});
RNIap.initConnection().then(() => {
  RNIap.flushFailedPurchasesCachedAsPendingAndroid().catch(() => {
  }).then(() => {
    this.getSubscriptions();
    this.purchaseUpdateSubscription = purchaseUpdatedListener(async (purchase: 
InAppPurchase | SubscriptionPurchase | ProductPurchase) => {
      this.setState({visibility:false})
      this.purchaseConfirmed(purchase,"componentDidMount")
      console.log("componentDidMount");
      const receipt = purchase.transactionReceipt;
      if (receipt) {
        await RNIap.finishTransaction(purchase, false);
      }
    });
     this.purchaseErrorSubscription = purchaseErrorListener((error: PurchaseError) => 
     {
      this.setState({visibility:false})
      // console.warn('purchaseErrorListener', error);
    });
    })
  })
 }