public static function refund_line_items() {
		ob_start();

		check_ajax_referer( 'order-item', 'security' );

		if ( ! current_user_can( 'edit_shop_orders' ) ) {
			wp_die( -1 );
		}

		$order_id               = isset( $_POST['order_id'] ) ? absint( $_POST['order_id'] ) : 0;
		$refund_amount          = isset( $_POST['refund_amount'] ) ? wc_format_decimal( sanitize_text_field( wp_unslash( $_POST['refund_amount'] ) ), wc_get_price_decimals() ) : 0;
		$refunded_amount        = isset( $_POST['refunded_amount'] ) ? wc_format_decimal( sanitize_text_field( wp_unslash( $_POST['refunded_amount'] ) ), wc_get_price_decimals() ) : 0;
		$refund_reason          = isset( $_POST['refund_reason'] ) ? sanitize_text_field( wp_unslash( $_POST['refund_reason'] ) ) : '';
		$line_item_qtys         = isset( $_POST['line_item_qtys'] ) ? json_decode( sanitize_text_field( wp_unslash( $_POST['line_item_qtys'] ) ), true ) : array();
		$line_item_totals       = isset( $_POST['line_item_totals'] ) ? json_decode( sanitize_text_field( wp_unslash( $_POST['line_item_totals'] ) ), true ) : array();
		$line_item_tax_totals   = isset( $_POST['line_item_tax_totals'] ) ? json_decode( sanitize_text_field( wp_unslash( $_POST['line_item_tax_totals'] ) ), true ) : array();
		$api_refund             = isset( $_POST['api_refund'] ) && 'true' === $_POST['api_refund'];
		$restock_refunded_items = isset( $_POST['restock_refunded_items'] ) && 'true' === $_POST['restock_refunded_items'];
		$refund                 = false;
		$response               = array();

		try {
			$order       = wc_get_order( $order_id );
			$max_refund  = wc_format_decimal( $order->get_total() - $order->get_total_refunded(), wc_get_price_decimals() );

			if ( ! $refund_amount || $max_refund < $refund_amount || 0 > $refund_amount ) {
				throw new Exception( __( 'Invalid refund amount', 'woocommerce' ) );
			}

			if ( wc_format_decimal( $order->get_total_refunded(), wc_get_price_decimals() ) !== $refunded_amount ) {
				throw new Exception( __( 'Error processing refund. Please try again.', 'woocommerce' ) );
			}

			// Prepare line items which we are refunding.
			$line_items = array();
			$item_ids   = array_unique( array_merge( array_keys( $line_item_qtys ), array_keys( $line_item_totals ) ) );

			foreach ( $item_ids as $item_id ) {
				$line_items[ $item_id ] = array(
					'qty'          => 0,
					'refund_total' => 0,
					'refund_tax'   => array(),
				);
			}
			foreach ( $line_item_qtys as $item_id => $qty ) {
				$line_items[ $item_id ]['qty'] = max( $qty, 0 );
			}
			foreach ( $line_item_totals as $item_id => $total ) {
				$line_items[ $item_id ]['refund_total'] = wc_format_decimal( $total );
			}
			foreach ( $line_item_tax_totals as $item_id => $tax_totals ) {
				$line_items[ $item_id ]['refund_tax'] = array_filter( array_map( 'wc_format_decimal', $tax_totals ) );
			}

			// Create the refund object.
			$refund = wc_create_refund(
				array(
					'amount'         => $refund_amount,
					'reason'         => $refund_reason,
					'order_id'       => $order_id,
					'line_items'     => $line_items,
					'refund_payment' => $api_refund,
					'restock_items'  => $restock_refunded_items,
				)
			);

			if ( is_wp_error( $refund ) ) {
				throw new Exception( $refund->get_error_message() );
			}

			if ( did_action( 'woocommerce_order_fully_refunded' ) ) {
				$response['status'] = 'fully_refunded';
			}
		} catch ( Exception $e ) {
			wp_send_json_error( array( 'error' => $e->getMessage() ) );
		}

		// wp_send_json_success must be outside the try block not to break phpunit tests.
		wp_send_json_success( $response );
	}