Orders use the following post meta keys for complete data storage: Meta Key Description Data Type Default _order_status Payment status: "paid" or "pending" String pending _order_total Total order amount (price + tax - discount) Float/String Empty _order_line_items Array of product line items with qty, price, tax, totals Array (serialized) Empty array _order_client_name Customer name from checkout String Empty _order_client_email Customer email address String (email) Empty _order_client_address Street address for billing String Empty _order_client_city City from billing address String Empty _order_client_state State/Province from billing String Empty _order_client_zip Zip/Postal code String Empty _order_client_country Country name from billing String Empty _order_billing_address Complete