How to manage Order Item Data in WooCommerce | https://www.ibenic.com/manage-order-item-meta-woocommerce

coupon_filter.php

<?php

// WC_Checkout

/**
 * Add coupon lines to the order.
 *
 * @param WC_Order $order Order instance.
 * @param WC_Cart  $cart  Cart instance.
 */
public function create_order_coupon_lines( &$order, $cart ) {
  foreach ( $cart->get_coupons() as $code => $coupon ) {
    $item = new WC_Order_Item_Coupon();
    // ... code removed for reading purposes
    
    /**
     * Action hook to adjust item before save.
     *
     * @since 3.0.0
     */
    do_action( 'woocommerce_checkout_create_order_coupon_item', $item, $code, $coupon, $order );

    // Add item to order and save.
    $order->add_item( $item );
  }
}

fee_filter.php

<?php

// WC_Checkout

/**
 * Add fees to the order.
 *
 * @param WC_Order $order Order instance.
 * @param WC_Cart  $cart  Cart instance.
 */
public function create_order_fee_lines( &$order, $cart ) {
  foreach ( $cart->get_fees() as $fee_key => $fee ) {
    $item                 = new WC_Order_Item_Fee();
    // ... code removed for reading purposes.

    /**
     * Action hook to adjust item before save.
     *
     * @since 3.0.0
     */
    do_action( 'woocommerce_checkout_create_order_fee_item', $item, $fee_key, $fee, $order );

    // Add item to order and save.
    $order->add_item( $item );
  }
}

hide_meta.php

<?php

add_filter( 'woocommerce_hidden_order_itemmeta', 'hide_my_item_meta' );

/**
 * Hiding item meta
 * 
 * @param array $hidden_meta Array of all meta data to hide.
 *
 * @return array
 */
function hide_my_item_meta( $hidden_meta ) {
  
  // Let's hide the meta 'something'.
  $hidden_meta[] = 'something';
  
  return $hidden_meta;
}

item_filter.php

<?php

add_filter( 'woocommerce_order_item_display_meta_key', 'change_order_item_meta_title', 20, 3 );

/**
 * Changing a meta title
 * @param  string        $key  The meta key
 * @param  WC_Meta_Data  $meta The meta object
 * @param  WC_Order_Item $item The order item object
 * @return string        The title
 */
function change_order_item_meta_title( $key, $meta, $item ) {
    
    // By using $meta-key we are sure we have the correct one.
    if ( 'something' === $meta->key ) { $key = 'SOMETHING'; }
     
    return $key;
}

add_filter( 'woocommerce_order_item_display_meta_value', 'change_order_item_meta_value', 20, 3 );

/**
 * Changing a meta value
 * @param  string        $value  The meta value
 * @param  WC_Meta_Data  $meta   The meta object
 * @param  WC_Order_Item $item   The order item object
 * @return string        The title
 */
function change_order_item_meta_value( $value, $meta, $item ) {
    
    // By using $meta-key we are sure we have the correct one.
    if ( 'something' === $meta->key ) { $value = 'SOMETHING'; }
     
    return $value;
}

item_hidden_filter.php

<?php

$hidden_order_itemmeta = apply_filters(
	'woocommerce_hidden_order_itemmeta', array(
		'_qty',
		'_tax_class',
		'_product_id',
		'_variation_id',
		'_line_subtotal',
		'_line_subtotal_tax',
		'_line_total',
		'_line_tax',
		'method_id',
		'cost',
	)
);

// ... 

meta_filter.php

<?php

add_filter( 'woocommerce_order_item_get_formatted_meta_data', 'change_formatted_meta_data', 20, 2 );

/**
 * Filterting the meta data of an order item.
 * @param  array         $meta_data Meta data array
 * @param  WC_Order_Item $item      Item object
 * @return array                    The formatted meta
 */
function change_formatted_meta_data( $meta_data, $item ) {
    $new_meta = array();
    foreach ( $meta_data as $id => $meta_array ) {
        // We are removing the meta with the key 'something' from the whole array.
        if ( 'something' === $meta_array->key ) { continue; }
        $new_meta[ $id ] = $meta_array;
    }
    return $new_meta;
}

product_filter.php

<?php

// class WC_Checkout 

/**
 * Add line items to the order.
 *
 * @param WC_Order $order Order instance.
 * @param WC_Cart  $cart  Cart instance.
 */
public function create_order_line_items( &$order, $cart ) {
  foreach ( $cart->get_cart() as $cart_item_key => $values ) {
    /**
     * Filter hook to get initial item object.
     *
     * @since 3.1.0
     */
    $item = apply_filters( 'woocommerce_checkout_create_order_line_item_object', new WC_Order_Item_Product(), $cart_item_key, $values, $order );

    // ... code removed for reading purposes

    /**
     * Action hook to adjust item before save.
     *
     * @since 3.0.0
     */
    do_action( 'woocommerce_checkout_create_order_line_item', $item, $cart_item_key, $values, $order );

    // Add item to order and save.
    $order->add_item( $item );
  }
}

shipping_add_meta.php

<?php

add_action( 'woocommerce_checkout_create_order_shipping_item', 'order_shipping_item', 20, 4 );

/**
 * @param $item
 * @param $package_key
 * @param $package
 */
function order_shipping_item( &$item, $package_key, $package, $order ) {
    // Let's assume that we have a textarea field as a shipping note on the checkout field.
    // This can be a note for the delivery company, for example: "Deliver between 12:00 and 19:00"
    $note = isset( $_POST['shipping_note'] ) ? sanitize_text_field( $_POST['shipping_note'] ) : '';
    
    if ( $note ) {
      $item->add_meta_data( '_note', $note, true );
    }
}

shipping_filter.php

<?php

// WC_Checkout

/**
 * Add shipping lines to the order.
 *
 * @param WC_Order $order                   Order Instance.
 * @param array    $chosen_shipping_methods Chosen shipping methods.
 * @param array    $packages                Packages.
 */
public function create_order_shipping_lines( &$order, $chosen_shipping_methods, $packages ) {
  foreach ( $packages as $package_key => $package ) {
    if ( isset( $chosen_shipping_methods[ $package_key ], $package['rates'][ $chosen_shipping_methods[ $package_key ] ] ) ) {
      $shipping_rate            = $package['rates'][ $chosen_shipping_methods[ $package_key ] ];
      $item                     = new WC_Order_Item_Shipping();
      // ... code removed for reading purposes.

      /**
       * Action hook to adjust item before save.
       *
       * @since 3.0.0
       */
      do_action( 'woocommerce_checkout_create_order_shipping_item', $item, $package_key, $package, $order );

      // Add item to order and save.
      $order->add_item( $item );
    }
  }
}

shipping_meta_title.php

<?php

add_filter( 'woocommerce_order_item_display_meta_key', 'change_shipping_note_title', 20, 3 );

/**
 * Changing the shipping note title
 * @param  string        $key  The meta key
 * @param  WC_Meta_Data  $meta The meta object
 * @param  WC_Order_Item $item The order item object
 * @return string        The title
 */
function change_shipping_note_title( $key, $meta, $item ) {
    
    // By using $meta-key we are sure we have the correct one.
    if ( '_note' === $meta->key ) { $key = __( 'Note', 'your_textdomain'); }
     
    return $key;
}

tax_filter.php

<?php

// WC_Checkout

/**
 * Add tax lines to the order.
 *
 * @param WC_Order $order Order instance.
 * @param WC_Cart  $cart  Cart instance.
 */
public function create_order_tax_lines( &$order, $cart ) {
  foreach ( array_keys( $cart->get_cart_contents_taxes() + $cart->get_shipping_taxes() + $cart->get_fee_taxes() ) as $tax_rate_id ) {
    if ( $tax_rate_id && apply_filters( 'woocommerce_cart_remove_taxes_zero_rate_id', 'zero-rated' ) !== $tax_rate_id ) {
      $item = new WC_Order_Item_Tax();
      // ... code removed for reading purposes

      /**
       * Action hook to adjust item before save.
       *
       * @since 3.0.0
       */
      do_action( 'woocommerce_checkout_create_order_tax_item', $item, $tax_rate_id, $order );

      // Add item to order and save.
      $order->add_item( $item );
    }
  }
}