Add custom field to “customer details” block in order email

We got this working, by filtering on “woocommerce_email_customer_details_fields” instead of “woocommerce_email_order_meta_keys” and adding a $fields array holding the data:

function custom_gift_card__order_meta_keys($fields, $sent_to_admin, $order ) {
	$fields['gift_card_comments'] = array(
	'label' => __('Gift Card Comments', 'woocommerce'),
	'placeholder' => _x('', 'placeholder', 'woocommerce'),
	'required' => true,
	'class' => array('form-row-last'),
	'clear' => true
	);
	$fields["gift_card_comments"]["value"] = get_post_meta( $order->id, 'Gift Card Comments', true );
	return $fields;
}
add_filter( 'woocommerce_email_customer_details_fields', 'custom_gift_card__order_meta_keys', 40, 3);

I tried this, but it didn’t work. Were there additional changes?

@tendigit, sorry about the late reply on this, I have been on parental leave and I missed many notifications.

Perhaps you have already solved this, but as far as I can remember, there was nothing else to it. The important part would be to make sure to update the code with the correct custom field value.

This worked for me (with my own fields listed) based on your response. The key has to match what’s in your custom field, so it’s not the name with underscores (first_time_member as one of my examples). If you include special characters in the key, like a quotation mark, be sure to escape it.

/**
 * Add custom fields to emails
 */
add_filter('woocommerce_email_customer_details_fields', 'my_checkout_field_order_meta_fields', 40, 3 );
function my_checkout_field_order_meta_fields( $fields, $sent_to_admin, $order ) {
  $fields['first_time_member'] = array(
    'label' => __( 'First Time Member?' ),
    'value' => get_post_meta( $order->id, 'First Time Member?', true ),
  );
  $fields['spouse_name'] = array(
    'label' => __( 'Spouse Name' ),
    'value' => get_post_meta( $order->id, 'Spouse Name', true ),
  );
  $fields['childrens_ages'] = array(
    'label' => __( 'Children\'s Ages' ),
    'value' => get_post_meta( $order->id, 'Children\'s Ages', true ),
  );
  return $fields;
}