Google Customer Reviews Snippet for WooCommerce

functions.php

/**
* QREUZ SNIPPET FOR WOOCOMMERCE / WORDPRESS
*
* @TITLE       Google Customer Reviews Snippet for WooCommerce
* @VERSION     1.4.2
* @DESCRIPTION Implements the necessary snippets to WooCommerce for collecting Google Customer Reviews from customers after purchase
* @FOR         Google Customer Reviews, https://support.google.com/merchants/answer/7124319
* @LINK        https://qreuz.com/snippets/google-customer-reviews-snippet-for-woocommerce/
* @AUTHOR      Qreuz GmbH <[email protected]>
* @LICENSE     GNU GPL v3 https://www.gnu.org/licenses/gpl-3.0
*/

/**
* This function will set the language for your GCR opt-in (and your GCR badge if you integrate it).
* replace the lang code with your store´s language; available languages can be found at https://support.google.com/merchants/answer/7106244
*
*/
function qreuz_google_customer_reviews_language() {
 $qreuz_customer_reviews_language_script = 'window.___gcfg = {lang: \'ru\'};';
   wp_register_script( 'qreuz_customer_reviews_language_script', '', '', 'false', 'true' );
   wp_enqueue_script( 'qreuz_customer_reviews_language_script' );
   wp_add_inline_script( 'qreuz_customer_reviews_language_script', $qreuz_customer_reviews_language_script );
}
add_action( 'wp_enqueue_scripts', 'qreuz_google_customer_reviews_language', 20 );

/**
* Adds the Google Customer Reviews opt-in form to the checkout confirmation page
* Add your merchant ID where the placeholder is.
*
* @param int|string $order_id WooCommerce order id
*
*/
function qreuz_google_customer_reviews_optin( $order_id ) {

 $order = new WC_Order( $order_id );

 ?>
 <script src="https://apis.google.com/js/platform.js?onload=renderOptIn" async defer></script>

 <script>			
       window.renderOptIn = function() {
       window.gapi.load('surveyoptin', function() {
         window.gapi.surveyoptin.render(
         {
           // REQUIRED FIELDS
           "merchant_id": ХХХХХХХХХХ, // place your merchant ID here, get it from your Merchant Center at https://merchants.google.com/mc/merchantdashboard
           "order_id": "<?php echo esc_attr( $order->get_order_number() ); ?>",
           "email": "<?php echo esc_attr( $order->get_billing_email() ); ?>",
           "delivery_country": "<?php echo esc_attr( $order->get_billing_country() ); ?>",
           "estimated_delivery_date": "<?php echo esc_attr( date( 'Y-m-d', strtotime( '+3 day', strtotime( $order->get_date_created() ) ) ) ); ?>",  // replace "5 day" with the estimated delivery time of your orders
           "opt_in_style": "CENTER_DIALOG"
         });
       });
       }</script>

 <?php
}
add_action( 'woocommerce_thankyou', 'qreuz_google_customer_reviews_optin' );

Thanks! I had tried other ways without success, your snippet was perfect!