Documentation
https://docs.woocommerce.com/wc-apidocs/class-WC_Order.html
Methods you can use
//GET THE ORDER OBJECT
$order = wc_get_order($order_id);
//THINGS YOU CAN READ:
//Get Order ID
$order->get_id();
//Get Order Totals
$order->get_formatted_order_total();
$order->get_cart_tax();
$order->get_currency();
$order->get_discount_tax();
$order->get_discount_to_display();
$order->get_discount_total();
$order->get_fees();
$order->get_formatted_line_subtotal();
$order->get_shipping_tax();
$order->get_shipping_total();
$order->get_subtotal();
$order->get_subtotal_to_display();
$order->get_tax_location();
$order->get_tax_totals();
$order->get_taxes();
$order->get_total();
$order->get_total_discount();
$order->get_total_tax();
$order->get_total_refunded();
$order->get_total_tax_refunded();
$order->get_total_shipping_refunded();
$order->get_item_count_refunded();
$order->get_total_qty_refunded();
$order->get_qty_refunded_for_item();
$order->get_total_refunded_for_item();
$order->get_tax_refunded_for_item();
$order->get_total_tax_refunded_by_rate_id();
$order->get_remaining_refund_amount();
//Get Order Items
$order->get_items();
$order->get_items_key();
$order->get_items_tax_classes();
$order->get_item();
$order->get_item_count();
$order->get_item_subtotal();
$order->get_item_tax();
$order->get_item_total();
$order->get_downloadable_items();
//Get Order Lines
$order->get_line_subtotal();
$order->get_line_tax();
$order->get_line_total();
//Get Order Shipping
$order->get_shipping_method();
$order->get_shipping_methods();
$order->get_shipping_to_display();
//Get Order Dates
$order->get_date_created();
$order->get_date_modified();
$order->get_date_completed();
$order->get_date_paid();
//Get Order User, Billing & Shipping Addresses
$order->get_customer_id();
$order->get_user_id();
$order->get_user();
$order->get_customer_ip_address();
$order->get_customer_user_agent();
$order->get_created_via();
$order->get_customer_note();
$order->get_address_prop();
$order->get_billing_first_name();
$order->get_billing_last_name();
$order->get_billing_company();
$order->get_billing_address_1();
$order->get_billing_address_2();
$order->get_billing_city();
$order->get_billing_state();
$order->get_billing_postcode();
$order->get_billing_country();
$order->get_billing_email();
$order->get_billing_phone();
$order->get_shipping_first_name();
$order->get_shipping_last_name();
$order->get_shipping_company();
$order->get_shipping_address_1();
$order->get_shipping_address_2();
$order->get_shipping_city();
$order->get_shipping_state();
$order->get_shipping_postcode();
$order->get_shipping_country();
$order->get_address();
$order->get_shipping_address_map_url();
$order->get_formatted_billing_full_name();
$order->get_formatted_shipping_full_name();
$order->get_formatted_billing_address();
$order->get_formatted_shipping_address();
//Get Order Payment Details
$order->get_payment_method();
$order->get_payment_method_title();
$order->get_transaction_id();
//Get Order URLs
$order->get_checkout_payment_url();
$order->get_checkout_order_received_url();
$order->get_cancel_order_url();
$order->get_cancel_order_url_raw();
$order->get_cancel_endpoint();
$order->get_view_order_url();
$order->get_edit_order_url();
//Get Order Status
$order->get_status();
Feel free to comment if you can add help to this page or point out issues and solutions you have found. I do not provide support on this site, if you need help with a problem head over to stack overflow.