@spicysparks/react-native-iap/src/internal/fillProductsWithAdditionalData.ts

React Native In App Purchase Module.

import {NativeModules} from 'react-native';

import type {ProductCommon} from '../types';

const {RNIapAmazonModule} = NativeModules;

/**
 * For Amazon products, we add the currency code from the user's information
 * since it isn't included in the product information.
 */
export const fillProductsWithAdditionalData = async <T extends ProductCommon>(
  items: T[],
): Promise<T[]> => {
  if (RNIapAmazonModule) {
    // On amazon we must get the user marketplace to detect the currency
    const user = await RNIapAmazonModule.getUser();

    const currencies = {
      CA: 'CAD',
      ES: 'EUR',
      AU: 'AUD',
      DE: 'EUR',
      IN: 'INR',
      US: 'USD',
      JP: 'JPY',
      GB: 'GBP',
      IT: 'EUR',
      BR: 'BRL',
      FR: 'EUR',
    };

    const currency =
      currencies[user.userMarketplaceAmazon as keyof typeof currencies];

    // Add currency to items
    items.forEach((item) => {
      if (currency) {
        const {originalPrice} = item;
        item.currency = currency;
        item.price = originalPrice ?? '0.0';
        item.localizedPrice = originalPrice ?? '0.0';
      }
    });
  }

  return items;
};