isSubscribed.js

import { Platform, NativeModules } from 'react-native';
import InAppBilling from 'react-native-billing'; // Android
import iapReceiptValidator from 'iap-receipt-validator';

const { InAppUtils } = NativeModules; // iOS

const PRODUCT_ID = Platform.select({
  ios: '',
  android: ''
});

export const isSubscribed = async () => {
    let subscriber = false;

    if (Platform.OS === 'android') {
        await InAppBilling.close();
        try {
            await InAppBilling.open();
            await InAppBilling.loadOwnedPurchasesFromGoogle();
            subscriber = await InAppBilling.isSubscribed(PRODUCT_ID);
        } catch (err) {
            throw err;
        } finally {
            await InAppBilling.close();
        }
    } else if (Platform.OS === 'ios') {
        const password = '...'; // Shared Secret from iTunes connect
        const production = false; // use sandbox or production url for validation
        const validateReceipt = iapReceiptValidator(password, production);

        try {
            const receiptData = '...'; // transactionReceipt da compra do usuário
            const validationData = await validateReceipt(receiptData);

            if (validationData['latest_receipt_info'][0].expires_date > 'data de hoje') {
                subscriber = true;
            }
        } catch (err) {
            throw err;
        }
    }

  return subscriber;
};