php - Add a custom field to an order in WooCommerce 3+

Solution:

To add a custom field to an order you can use:

• WordPressupdate_post_meta() function (from an order id):

  $order_id = $order->get_id(); // If needed
  
  update_post_meta($order_id, 'referenceNumber', 'ordercreated'); // add and save the custom field
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• WooCommerceWC_Dataupdate_meta_data() method (from the order object or the order id):

  $order = wc_get_order( $order_id ); // If needed: Get the WC_Order object from the order Id
  
  update_meta_data('referenceNumber', 'ordercreated'); // Add the custom field
  
  $order->save(); // Save the data
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WherereferenceNumber is the meta key andordercreated is the meta value. Both works.

Now to add a custom field to an order when customer place an order, you can use:

• woocommerce_checkout_create_order action hook (before order data is saved - used to adjust order data before it's saved):

  add_action( 'woocommerce_checkout_create_order', 'add_custom_field_on_placed_order', 10, 2 );
  function add_custom_field_on_placed_order( $order, $data ){
      $order->update_meta_data( 'referenceNumber', 'ordercreated' );
  }
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• woocommerce_checkout_update_order_meta action hook (order already exist - used to add custom meta data):

  add_action( 'woocommerce_checkout_create_order', 'add_custom_field_on_placed_order', 10, 2 );
  function add_custom_field_on_placed_order( $order_id, $data ){
      $order->update_meta_data( 'referenceNumber', 'ordercreated' );
  }
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• woocommerce_checkout_order_created action hook (order already exist - to trigger an action or also to add custom meta data):

  add_action( 'woocommerce_checkout_order_created', 'add_custom_field_on_placed_order', 10, 2 );
  function add_custom_field_on_placed_order( $order_id, $data ){
      $order->update_meta_data( 'referenceNumber', 'ordercreated' ); // Add the custom field
      $order->save(); // Save data (as order exist yet)
  }
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  Or:

  add_action( 'woocommerce_checkout_order_created', 'add_custom_field_on_placed_order' );
  function add_custom_field_on_placed_order( $order ){
      update_post_meta($order->get_id(), 'referenceNumber', 'ordercreated');
  }
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Code goes in functions.php file of your active child theme (or active theme). Tested and works.

Solution:

Hi i had a similar requirement few days ago, as i needed to add new field at checkout. Following article helped me. You can check it too. Here is the link. Basically you will have a write a function which will use woo commerce hook "woocommerce_default_address_fields" https://wisdmlabs.com/blog/add-custom-fields-woocommerce-checkout-page/