Function to copy a WooCommerce order

function ccom_duplicate_order( $original_order_id ) {
	
	// Load Original Order
	$original_order = wc_get_order( $original_order_id );
	$user_id = $original_order->get_user_id();

	// Setup Cart
	WC()->frontend_includes();
	WC()->session = new WC_Session_Handler();
	WC()->session->init();
	WC()->customer = new WC_Customer( $user_id, true );
	WC()->cart = new WC_Cart();

	// Setup New Order
	$checkout = WC()->checkout();
	WC()->cart->calculate_totals();
	$order_id = $checkout->create_order( [ ] );
	$order = wc_get_order( $order_id );
	update_post_meta( $order_id, '_customer_user', get_current_user_id() );

	// Header
	update_post_meta( $order_id, '_order_shipping',         get_post_meta($original_order_id, '_order_shipping', true) );
	update_post_meta( $order_id, '_order_discount',         get_post_meta($original_order_id, '_order_discount', true) );
	update_post_meta( $order_id, '_cart_discount',          get_post_meta($original_order_id, '_cart_discount', true) );
	update_post_meta( $order_id, '_order_tax',              get_post_meta($original_order_id, '_order_tax', true) );
	update_post_meta( $order_id, '_order_shipping_tax',     get_post_meta($original_order_id, '_order_shipping_tax', true) );
	update_post_meta( $order_id, '_order_total',            get_post_meta($original_order_id, '_order_total', true) );
	update_post_meta( $order_id, '_order_key',              'wc_' . apply_filters('woocommerce_generate_order_key', uniqid( 'order_' ) ) );
	update_post_meta( $order_id, '_customer_user',          get_post_meta($original_order_id, '_customer_user', true) );
	update_post_meta( $order_id, '_order_currency',         get_post_meta($original_order_id, '_order_currency', true) );
	update_post_meta( $order_id, '_prices_include_tax',     get_post_meta($original_order_id, '_prices_include_tax', true) );
	update_post_meta( $order_id, '_customer_ip_address',    get_post_meta($original_order_id, '_customer_ip_address', true) );
	update_post_meta( $order_id, '_customer_user_agent',    get_post_meta($original_order_id, '_customer_user_agent', true) );

	// Billing
	update_post_meta( $order_id, '_billing_city',           get_post_meta($original_order_id, '_billing_city', true));
	update_post_meta( $order_id, '_billing_state',          get_post_meta($original_order_id, '_billing_state', true));
	update_post_meta( $order_id, '_billing_postcode',       get_post_meta($original_order_id, '_billing_postcode', true));
	update_post_meta( $order_id, '_billing_email',          get_post_meta($original_order_id, '_billing_email', true));
	update_post_meta( $order_id, '_billing_phone',          get_post_meta($original_order_id, '_billing_phone', true));
	update_post_meta( $order_id, '_billing_address_1',      get_post_meta($original_order_id, '_billing_address_1', true));
	update_post_meta( $order_id, '_billing_address_2',      get_post_meta($original_order_id, '_billing_address_2', true));
	update_post_meta( $order_id, '_billing_country',        get_post_meta($original_order_id, '_billing_country', true));
	update_post_meta( $order_id, '_billing_first_name',     get_post_meta($original_order_id, '_billing_first_name', true));
	update_post_meta( $order_id, '_billing_last_name',      get_post_meta($original_order_id, '_billing_last_name', true));
	update_post_meta( $order_id, '_billing_company',        get_post_meta($original_order_id, '_billing_company', true));

	// Shipping
	update_post_meta( $order_id, '_shipping_country',       get_post_meta($original_order_id, '_shipping_country', true));
	update_post_meta( $order_id, '_shipping_first_name',    get_post_meta($original_order_id, '_shipping_first_name', true));
	update_post_meta( $order_id, '_shipping_last_name',     get_post_meta($original_order_id, '_shipping_last_name', true));
	update_post_meta( $order_id, '_shipping_company',       get_post_meta($original_order_id, '_shipping_company', true));
	update_post_meta( $order_id, '_shipping_address_1',     get_post_meta($original_order_id, '_shipping_address_1', true));
	update_post_meta( $order_id, '_shipping_address_2',     get_post_meta($original_order_id, '_shipping_address_2', true));
	update_post_meta( $order_id, '_shipping_city',          get_post_meta($original_order_id, '_shipping_city', true));
	update_post_meta( $order_id, '_shipping_state',         get_post_meta($original_order_id, '_shipping_state', true));
	update_post_meta( $order_id, '_shipping_postcode',      get_post_meta($original_order_id, '_shipping_postcode', true));

	// Shipping Items
	$original_order_shipping_items = $original_order->get_items( 'shipping' );
	foreach ( $original_order_shipping_items as $original_order_shipping_item ) {
		$item_id = wc_add_order_item( $order_id, array(
			'order_item_name' => $original_order_shipping_item['name'],
			'order_item_type' => 'shipping'
		) );
		if ( $item_id ) {
			wc_add_order_item_meta( $item_id, 'method_id', $original_order_shipping_item['method_id'] );
			wc_add_order_item_meta( $item_id, 'cost', wc_format_decimal( $original_order_shipping_item['cost'] ) );
		}
	}

	// Coupons
	$original_order_coupons = $original_order->get_items( 'coupon' );
	foreach ( $original_order_coupons as $original_order_coupon ) {
		$item_id = wc_add_order_item( $order_id, array(
			'order_item_name' => $original_order_coupon['name'],
			'order_item_type' => 'coupon'
		) );
		if ( $item_id ) {
			wc_add_order_item_meta( $item_id, 'discount_amount', $original_order_coupon['discount_amount'] );
		}
	}

	// Payment
	update_post_meta( $order_id, '_payment_method', get_post_meta( $original_order_id, '_payment_method', true ) );
	update_post_meta( $order_id, '_payment_method_title', get_post_meta( $original_order_id, '_payment_method_title', true ) );
	update_post_meta( $order_id, 'Transaction ID', get_post_meta( $original_order_id, 'Transaction ID', true ) );

	// Line Items
	foreach( $original_order->get_items() as $originalOrderItem ) {
		$itemName = $originalOrderItem['name'];
		$qty = $originalOrderItem['qty'];
		$lineTotal = $originalOrderItem['line_total'];
		$lineTax = $originalOrderItem['line_tax'];
		$productID = $originalOrderItem['product_id'];
		$item_id = wc_add_order_item( $order_id, array(
				'order_item_name' => $itemName,
				'order_item_type' => 'line_item'
		) );
		wc_add_order_item_meta( $item_id, '_qty', $qty );
		wc_add_order_item_meta( $item_id, '_tax_class', $originalOrderItem['tax_class'] );
		wc_add_order_item_meta( $item_id, '_product_id', $productID );
		wc_add_order_item_meta( $item_id, '_variation_id', $originalOrderItem['variation_id'] );
		wc_add_order_item_meta( $item_id, '_line_subtotal', wc_format_decimal( $lineTotal ) );
		wc_add_order_item_meta( $item_id, '_line_total', wc_format_decimal( $lineTotal ) );
		wc_add_order_item_meta( $item_id, '_line_tax', wc_format_decimal( $lineTax ) );
		wc_add_order_item_meta( $item_id, '_line_subtotal_tax', wc_format_decimal( $originalOrderItem['line_subtotal_tax'] ) );
	}

	// Close New Order
	$order->calculate_totals();
	$order->payment_complete();

	// Note
	$order->update_status( 'processing' );
	$message = sprintf(
		'This order was duplicated from order %d.',
		$original_order_id
	);
	$order->add_order_note( $message );

	// Return
	return $order_id;

}