Notify admin of customer address changes - Email the site admin when a customer changes their billing or shipping address in WooCommerce. https://www.damiencarbery.com/2019/09/notify-admin-of-customer-address-changes/

notify-admin-of-address-change.php

<?php
/*
Plugin Name: Notify admin of customer address changes
Plugin URI: https://www.damiencarbery.com/2019/09/notify-admin-of-customer-address-changes/
Description: Email the site admin when a customer changes their billing or shipping address in WooCommerce.
Author: Damien Carbery
Author URI: https://www.damiencarbery.com
Version: 0.2
WC tested up to: 8.2.2
*/


add_action( 'woocommerce_after_save_address_validation', 'dcwd_after_save_address', 10, 4 );
function dcwd_after_save_address( $user_id, $load_address, $address, $customer ) {
	//error_log( 'User ID: ' . $user_id );
	//error_log( 'Load address: ' . var_export( $load_address, true ) );
	//error_log( 'Address: ' . var_export( $address, true ) );
	//error_log( 'Customer: ' . var_export( $customer, true ) );


	// Retrieve any changes.
	$customer_original_info = new WC_Customer( $user_id );
	$fields_changed = $customer->get_changes();
	$existing_address = array();
	if ( 'billing' == $load_address ) {
		$existing_address = $customer_original_info->get_billing();
	}
	else {
		$existing_address = $customer_original_info->get_shipping();
	}

	// Create a list of the changes, with a friendly name for each field (e.g. 'Company Name'
	// instead of 'company_name') and the old and new values.
	$changes_text = array();
	// Check that there are changes before looping through the list of changed fields.
	if ( array_key_exists( $load_address, $fields_changed ) ) {
		foreach ( $fields_changed[ $load_address ] as $field => $value ) {
			$changes_text[] = sprintf( '%s from "%s" to "%s"', $address[ $load_address . '_' . $field ][ 'label' ], $existing_address[ $field ], $value );
		}
	}

	if ( $changes_text ) {
		error_log( 'Customer changed ' . ucwords( $load_address ). " address fields:\n" . implode( "\n", $changes_text ) );
		
		// Send the email to the admin.
		$subject = sprintf( 'Customer address change: %s (%d)', $customer->get_display_name(), $user_id );
		$body[] = sprintf( 'Customer %s (ID: %d) changed %s address fields.', $customer->get_display_name(), $user_id, $load_address );
		$body[] = '';
		$body[] = 'Changes:';
		$body[] = '- ' . implode( "\n- ", $changes_text );

		wp_mail( get_option( 'admin_email' ), $subject, implode( "\n", $body ) );
	}
	else {
		// It's possible to save the form without changing anything.
		//error_log( 'No changes were made.' );
	}
}