Integrating Google Play Billing Validator with Node.js

bilingValidator.js

var GoogleReceiptVerify = require('google-play-billing-validator')
// some module that handles management of subscription data
var Subscriptions = require('../data/Subscriptions')

// instantiate google receipt verify
var googleReceiptVerify = new GoogleReceiptVerify({
  email: ServiceAccount.client_email,
  key: ServiceAccount.private_key
});

// function that handles validation
const init = async (productId, purchaseToken) => {

  let response = await googleReceiptVerify.verifySub({
    packageName: "<YOUR_APP_ID>",
    productId: productId,
    purchaseToken: purchaseToken,
  });

  if (response.isSuccessful === true) {

    // insert receipt and products record
    await Plans.insertPurchaseReceiptRecord({
      purchaseToken: purchaseToken,
      verified: true,
      products: response['payload']
    });

    // convert the returned expiry timestamp from milliseconds to seconds
    let expirationUnix = Math.round(response['payload'].expiryTimeMillis / 1000);

    // further processing.
    let result = await Subscriptions.processSuccessfulSubscription(productId, expirationUnix);

    // log final processing result
    console.log(result);

  } else {

    // error: validation not successful
    console.log(response.errorMessage);
  }
}

// --- initiate function ---

const purchaseToken = '<PURCHASE_TOKEN>';
const productId = '<PRODUCT_ID>';

init(productId, purchaseToken);