How Do You Add a Note in Checkout WooCommerce?

Adding a note in checkout on WooCommerce is easy!

First, add the following code to your functions.php file:

add_action( 'woocommerce_after_order_notes', 'custom_checkout_field' );

function custom_checkout_field( $checkout ) {

  echo '<div id="custom-checkout-field">';

  WooCommerce_form_field( 'order_comments', array(
   'type'          => 'textarea',
   'class'         => array('my-field-class form-row-wide'),
   'label'         => __('Order Notes'),
   'placeholder'   => __('Notes about your order, e.g. special instructions'),
   ), $checkout->get_value( 'order_comments' ));

  echo '</div>';
}

This code adds a new field to the checkout page where customers can leave notes about their order.

Next, add the following code to your functions.php file:

add_action( 'woocommerce_checkout_update_order_meta', 
'custom_checkout_field_update_order_meta' );
 
function custom_checkout_field_update_order_meta( $orderID ) {
    if ( ! empty( $_POST['order_comments'] ) ) {
        update_post_meta( 
        $orderID, 'Order Comments', sanitize_textarea_field( 
        $_POST['ordernotes'] ) );			
   }		
  }

This code saves the data from the custom checkout field to the order meta data.

Now when a customer adds a note to their order, you will be able to see it in the order details page and in the order admin.