In app purchases (IAP) are a great way to monetize your React Native applications. With IAP, users can purchase digital or physical products from within your app. In this tutorial, we’ll be walking through how to add IAP to a React Native project. We’ll cover setting up the project, installing the react-native-iap library, building the UI, adding IAP to the project, handling different purchase types, consuming IAP in React Native, and restoring IAP.

![react native in app purchases iap](https:&#x2F;&#x2F;devbrite.io&#x2F;media&#x2F;cover8.jpg)
## Setting up the React Native Project

Before we can get started, we need to set up a React Native project. To do this, we’ll need to install the React Native CLI and then use it to create a new project. 

First, let’s install the React Native CLI:

&#96;&#96;&#96;
npm install -g react-native-cli
&#96;&#96;&#96;

Once the CLI is installed, we can create a new project:

&#96;&#96;&#96;
react-native init MyIAPProject
&#96;&#96;&#96;

This will create a new React Native project in the &#96;MyIAPProject&#96; directory. 

## Installing react-native-iap

The next step is to install the react-native-iap library. This library provides an easy way to add IAP to a React Native project. To install it, we’ll use npm:

&#96;&#96;&#96;
cd MyIAPProject
npm install --save react-native-iap
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This will install the library and add it to our project’s &#96;package.json&#96; file.

## Building the In App Purchases UI

Now that we have the library installed, we can start working on the UI. We’ll need to create a screen that displays all of the available products and allows users to purchase them. 

We’ll start by creating a &#96;ProductList&#96; component. This component will display a list of products that we can purchase. We’ll use the &#96;FlatList&#96; component to render the list of products:

&#96;&#96;&#96;javascript
import React from &#x27;react&#x27;;
import { FlatList, Text } from &#x27;react-native&#x27;;

export default class ProductList extends React.Component {
  render() {
    return (
      &lt;FlatList
        data={this.props.products}
        renderItem={({ item }) =&gt; &lt;Text&gt;{item.title}&lt;&#x2F;Text&gt;}
        keyExtractor={item =&gt; item.id}
      &#x2F;&gt;
    );
  }
}
&#96;&#96;&#96;

Next, we’ll need to create a &#96;PurchaseButton&#96; component. This component will be responsible for handling the purchase process. It will display a button that the user can press to initiate the purchase. We’ll use the &#96;TouchableOpacity&#96; component to create the button:

&#96;&#96;&#96;javascript
import React from &#x27;react&#x27;;
import { TouchableOpacity, Text } from &#x27;react-native&#x27;;

export default class PurchaseButton extends React.Component {
  render() {
    return (
      &lt;TouchableOpacity onPress={this.props.onPress}&gt;
        &lt;Text&gt;Purchase&lt;&#x2F;Text&gt;
      &lt;&#x2F;TouchableOpacity&gt;
    );
  }
}
&#96;&#96;&#96;

## Adding In App Purchases to the React Native Project

Now that we have our UI components set up, we can start adding IAP to our project. We’ll start by creating a &#96;Product&#96; object. This object will hold all of the information about a product that we want to offer for sale. We’ll use the &#96;react-native-iap&#96; library to create the &#96;Product&#96; object:

&#96;&#96;&#96;javascript
import { 
  Product, 
  Subscription 
} from &#x27;react-native-iap&#x27;;

const products = [
  new Product(&#x27;product_id_1&#x27;, &#x27;Product 1&#x27;, &#x27;My first product&#x27;),
  new Subscription(&#x27;subscription_id_1&#x27;, &#x27;Subscription 1&#x27;, &#x27;My first subscription&#x27;)
];
&#96;&#96;&#96;

Next, we’ll need to create a function that will handle the purchase process. This function will be responsible for initiating the purchase, handling any errors, and updating the UI when the purchase is successful. We’ll use the &#96;requestPurchase&#96; method from the &#96;react-native-iap&#96; library to initiate the purchase:

&#96;&#96;&#96;javascript
import { 
  Product, 
  Subscription,
  requestPurchase 
} from &#x27;react-native-iap&#x27;;

const purchaseProduct = async (productId) =&gt; {
  try {
    const purchase = await requestPurchase(productId);
    &#x2F;&#x2F; Update UI
  } catch (err) {
    &#x2F;&#x2F; Handle error
  }
};
&#96;&#96;&#96;

Finally, we’ll need to pass the &#96;purchaseProduct&#96; function to our &#96;PurchaseButton&#96; component. This will allow us to initiate a purchase when the user presses the button. 

&#96;&#96;&#96;javascript
import React from &#x27;react&#x27;;
import { TouchableOpacity, Text } from &#x27;react-native&#x27;;
import { requestPurchase } from &#x27;react-native-iap&#x27;;

export default class PurchaseButton extends React.Component {
  render() {
    return (
      &lt;TouchableOpacity onPress={() =&gt; this.props.onPress(this.props.productId)}&gt;
        &lt;Text&gt;Purchase&lt;&#x2F;Text&gt;
      &lt;&#x2F;TouchableOpacity&gt;
    );
  }
}
&#96;&#96;&#96;

## Handling Different Purchase Types in React Native

Now that we have the purchase process set up, we need to handle different types of purchases. We’ll need to handle one-time purchases and subscription purchases differently.

For one-time purchases, we’ll need to check the &#96;purchase.transactionReceipt&#96; to make sure the purchase is valid. We’ll also need to update our database to reflect the purchase.

For subscription purchases, we’ll need to store the &#96;purchase.transactionReceipt&#96; so we can check for a valid subscription each time the user launches the app. We’ll also need to update our database to reflect the subscription.

## Consuming In App Purchases in React Native

Once a user has purchased an item, we need to make sure that item is consumed. This means that the user can’t purchase it again. We’ll use the &#96;consumePurchase&#96; method from the &#96;react-native-iap&#96; library to consume the purchase:

&#96;&#96;&#96;javascript
import { 
  Product, 
  Subscription,
  requestPurchase,
  consumePurchase 
} from &#x27;react-native-iap&#x27;;

const consumeProduct = async (productId) =&gt; {
  try {
    const purchase = await consumePurchase(productId);
    &#x2F;&#x2F; Update UI
  } catch (err) {
    &#x2F;&#x2F; Handle error
  }
};
&#96;&#96;&#96;

## Restoring In App Purchases in React Native

Finally, we need to make sure our users can restore their purchases if they uninstall the app or switch devices. We’ll use the &#96;getPurchaseHistory&#96; method from the &#96;react-native-iap&#96; library to restore the purchases:

&#96;&#96;&#96;javascript
import { 
  Product, 
  Subscription,
  requestPurchase,
  consumePurchase,
  getPurchaseHistory 
} from &#x27;react-native-iap&#x27;;

const restorePurchases = async () =&gt; {
  try {
    const purchases = await getPurchaseHistory();
    &#x2F;&#x2F; Update UI
  } catch (err) {
    &#x2F;&#x2F; Handle error
  }
};
&#96;&#96;&#96;

## Running the React Native Project

Now that we have everything set up, we can run our project and test out the IAP functionality. To run the project, we’ll need to use the React Native CLI:

&#96;&#96;&#96;
cd MyIAPProject
react-native run-ios
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This will launch the app in the iOS Simulator. We can then test out the IAP functionality and make sure it works as expected. 

## Conclusion

In this tutorial, we’ve walked through how to add in app purchases (IAP) to a React Native project. We’ve covered setting up the project, installing the react-native-iap library, building the UI, adding IAP to the project, handling different purchase types, consuming IAP in React Native, and restoring IAP. With this knowledge, you should now be able to add IAP to your own React Native projects.

How To Add In App Purchases (IAP) in React Native

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