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To implement Apple Pay in your React Native project using the provided hook code, you'll need to integrate with the Stripe SDK and handle the necessary callbacks. Here's an example of how you can implement the Apple Pay code using the given hook:

Make sure you have the Stripe SDK installed in your project by following the Stripe documentation.

Import the required dependencies in your file:

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import { NativeEventEmitter, NativeModules } from 'react-native';
import {
  ApplePayError,
  StripeError,
  ApplePay,
} from '../types'; // Import the necessary types
import { useEffect, useState, useCallback } from 'react';
import { useStripe } from './useStripe';
Add the following code for the useApplePay hook:
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export function useApplePay({
  onShippingMethodSelected,
  onShippingContactSelected,
}: Props = {}) {
  const {
    isApplePaySupported,
    presentApplePay: _presentApplePay,
    confirmApplePayPayment: _confirmApplePayPayment,
    updateApplePaySummaryItems,
    openApplePaySetup: _openApplePaySetup,
  } = useStripe();
  const [items, setItems] = useState<ApplePay.CartSummaryItem[] | null>(null);
  const [loading, setLoading] = useState(false);

  const onDidSetShippingMethod = useCallback(
    (result: { shippingMethod: ApplePay.ShippingMethod }) => {
      if (onShippingMethodSelected) {
        onShippingMethodSelected(
          result.shippingMethod,
          updateApplePaySummaryItems
        );
      } else {
        updateApplePaySummaryItems(items as ApplePay.CartSummaryItem[]);
      }
    },
    [items, onShippingMethodSelected, updateApplePaySummaryItems]
  );

  const onDidSetShippingContact = useCallback(
    (result: { shippingContact: ApplePay.ShippingContact }) => {
      if (onShippingContactSelected) {
        onShippingContactSelected(
          result.shippingContact,
          updateApplePaySummaryItems
        );
      } else {
        updateApplePaySummaryItems(items as ApplePay.CartSummaryItem[]);
      }
    },
    [items, onShippingContactSelected, updateApplePaySummaryItems]
  );

  useEffect(() => {
    const eventEmitter = new NativeEventEmitter(NativeModules.StripeSdk);
    const didSetShippingMethodListener = eventEmitter.addListener(
      SET_SHIPPING_METHOD_CALLBACK_NAME,
      onDidSetShippingMethod
    );
    const didSetShippingContactListener = eventEmitter.addListener(
      SET_SHIPPING_CONTACT_CALLBACK_NAME,
      onDidSetShippingContact
    );

    return () => {
      didSetShippingMethodListener.remove();
      didSetShippingContactListener.remove();
    };
  }, [onDidSetShippingContact, onDidSetShippingMethod]);

  const presentApplePay = useCallback(
    async (params: ApplePay.PresentParams) => {
      setLoading(true);
      setItems(params.cartItems);
      const result = await _presentApplePay(params);
      if (result.error) {
        setItems(null);
      }
      setLoading(false);
      return result;
    },
    [_presentApplePay]
  );

  const openApplePaySetup = useCallback(async () => {
    setLoading(true);
    const result = await _openApplePaySetup();
    setLoading(false);
    return result;
  }, [_openApplePaySetup]);

  const confirmApplePayPayment = useCallback(
    async (clientSecret: string) => {
      setLoading(true);
      const result = await _confirmApplePayPayment(clientSecret);
      setItems(null);
      setLoading(false);
      return result;
    },
    [_confirmApplePayPayment]
  );

  return {
    loading,
    presentApplePay,
    confirmApplePayPayment,
    isApplePaySupported,
    openApplePaySetup,
  };
}



You can now use the useApplePay hook in your React Native components. Here's an example of how you can use it:
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import { useApplePay } from './useApplePay';

const MyComponent = () => {
  const { presentApplePay } = useApplePay();

  const handleApplePay = async () => {
    // Prepare the required Apple Pay parameters
    const applePayParams: ApplePay.PresentParams = {
      cartItems: [
        { label: 'Example item name 1', amount: '11.00' },
        { label: 'Example item name 2', amount: '25.00' },
      ],
    };

    // Call the presentApplePay function
    const result = await presentApplePay(applePayParams);

    if (result.error) {
      // Handle the error
      console.log('Apple Pay Error:', result.error);
    } else {
      // Handle the success
      console.log('Apple Pay Payment Succeeded');
    }
  };

  return (
    <button onClick={handleApplePay}>Pay with Apple Pay</button>
  );
};

export default MyComponent;
In this example, the presentApplePay function is used to initiate the Apple Pay payment process. You can modify the parameters and handle the success/error responses according to your requirements.

Remember to integrate the Stripe SDK and configure it properly to work with Apple Pay. Refer to the Stripe documentation for more details on integrating Apple Pay with your React Native project.