deprecated function warning

Hi,

Thank you for the good payment gateway. I found some issue in your plugin.

Please have a look the log and fix this issue in next version.

[29-Nov-2017 23:01:33 UTC] id was called incorrectly. Order properties should not be accessed directly. Backtrace: require(‘wp-blog-header.php’), require_once(‘wp-includes/template-loader.php’), do_action(‘template_redirect’), WP_Hook->do_action, WP_Hook->apply_filters, call_user_func_array, WC_AJAX::do_wc_ajax, do_action(‘wc_ajax_checkout’), WP_Hook->do_action, WP_Hook->apply_filters, call_user_func_array, WC_AJAX::checkout, WC_Checkout->process_checkout, WC_Checkout->process_order_payment, WC_Gateway_WooCommerce_POLi->process_payment, WC_Order->update_status, WC_Order->save, WC_Order->status_transition, do_action(‘woocommerce_order_status_pending_to_on-hold’), WP_Hook->do_action, WP_Hook->apply_filters, call_user_func_array, WC_Emails::send_transactional_email, do_action_ref_array, WP_Hook->do_action, WP_Hook->apply_filters, call_user_func_array, WC_Email_Customer_On_Hold_Order->trigger, WC_Email->get_content, WC_Email_Customer_On_Hold_Order->get_content_html, wc_get_template_html, wc_get_template, include(‘/plugins/woocommerce/templates/emails/customer-on-hold-order.php’), do_action(‘woocommerce_email_customer_details’), WP_Hook->do_action, WP_Hook->apply_filters, call_user_func_array, add_verification_id_to_emails_notifications, WC_Abstract_Legacy_Order->__get, wc_doing_it_wrong. This message was added in version 3.0.

[29-Nov-2017 23:01:34 UTC] The woocommerce_get_page_id function is deprecated since version 3.0. Replace with wc_get_page_id.

[29-Nov-2017 23:01:34 UTC] The wc_get_page_id argument is deprecated since version 2.1. The “pay” and “thanks” pages are no-longer used – an endpoint is added to the checkout instead. To get a valid link use the WC_Order::get_checkout_payment_url() or WC_Order::get_checkout_order_received_url() methods instead.