I'm trying to add in-app purchase in my ios App "react native".But in App store should i add screenshots in Review Information sections, So what's should i add here?

and I use 'react-native-iap',

when I call getProducts() it returns empty array so how can i fix it?

Edit

after a couple of days Sadly I just using Testflight and it takes a lot of time to debug!!

So i just found a friend who has an iPhone and tests it,It works and Buys successfullyBut now he's very busy So

I just want when users buy products successfully Dispatch an action to change something in the app 'access to full features' and send a request to our API.

So how can i know if this user buys successful or not?

here's my code

getProduct = async () => {    try {      await RNIap.initConnection();      // console.log('init?', init);      const availablePurchases = await RNIap.getProducts(items);      console.log('availablePurchases', availablePurchases);      this.setState({        availablePurchases,      });    } catch (err) {      // console.warn(err);      Alert.alert('Error purchase available', JSON.stringify(err));    }  };  requestSubscription = async sku => {    try {     let req = await RNIap.requestSubscription(sku);    // is here should i check    // if (req) dispatch action?    } catch (err) {      Alert.alert(err.code, err.message);    }  };