Youzify - BuddyPress Automatically add new users to a group after a complete payment in Woocommerce

yzc_auto_join_groups_on_payment.php

<?php
/*
 * Youzify - BuddyPress Automatically add new users to a group after a complete payment
 */
add_action( 'woocommerce_payment_complete', 'yzc_auto_join_groups_on_payment' );

function yzc_auto_join_groups_on_payment( $order_id ) {

     //  Get data.
     $order = wc_get_order( $order_id );
     $products = $order->get_items();

     $data = array( 'product_id1' => 'group_id1' , 'product_id2' => 'group_id2' );

     foreach ( $products as $prod ){
          if ( isset( $data[ $prod['product_id'] ] ) ) {
               groups_accept_invite( $order->get_customer_id(), $data[ $prod['product_id'] ] );
          }
     }
}