Included method to define a link format for a transaction ID, set transaction ID manually, and tweaked display.

assets/css/admin.less

@@ -517,7 +517,7 @@ ul.wc_coupon_list_block {
 		._shipping_last_name_field, ._shipping_address_2_field, ._shipping_postcode_field, ._shipping_state_field {
 			float: right;
 		}
-		._billing_company_field, ._shipping_company_field {
+		._billing_company_field, ._shipping_company_field, ._transaction_id_field {
 			clear: both;
 			width: 100%;
 		}

includes/abstracts/abstract-wc-payment-gateway.php

@@ -17,41 +17,44 @@ if ( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly
 abstract class WC_Payment_Gateway extends WC_Settings_API {
 
 	/** @var string Payment method ID. */
-	var $id;
+	public $id;
 
 	/** @var string Set if the place order button should be renamed on selection. */
-	var $order_button_text;
+	public $order_button_text;
 
 	/** @var string Payment method title. */
-	var $title;
+	public $title;
 
 	/** @var string Chosen payment method id. */
-	var $chosen;
+	public $chosen;
 
 	/** @var bool True if the gateway shows fields on the checkout. */
-	var $has_fields;
+	public $has_fields;
 
 	/** @var array Array of countries this gateway is allowed for. */
-	var $countries;
+	public $countries;
 
 	/** @var string Available for all counties or specific. */
-	var $availability;
+	public $availability;
 
 	/** @var string 'yes' if the method is enabled. */
-	var $enabled;
+	public $enabled;
 
 	/** @var string Icon for the gateway. */
-	var $icon;
+	public $icon;
 
 	/** @var string Description for the gateway. */
-	var $description;
+	public $description;
 
 	/** @var array Array of supported features such as 'default_credit_card_form' */
-	var $supports		= array( 'products' );
+	public $supports		= array( 'products' );
 
 	/** @var int Maximum transaction amount, zero does not define a maximum */
 	public $max_amount = 0;
 
+	/** @var string Optional URL to view a transaction */
+	public $view_transaction_url = '';
+
 	/**
 	 * Get the return url (thank you page)
 	 *
@@ -73,6 +76,19 @@ abstract class WC_Payment_Gateway extends WC_Settings_API {
 		return apply_filters( 'woocommerce_get_return_url', $return_url );
 	}
 
+	/**
+	 * Get a link to the transaction on the 3rd party gateway size (if applicable)
+	 * @param  string $transaction_id
+	 * @return string
+	 */
+	public function get_transaction_url( $transaction_id ) {
+		$return_url = '';
+		if ( ! empty( $this->view_transaction_url ) && ! empty( $transaction_id ) ) {
+			$return_url = sprintf( $this->view_transaction_url, $transaction_id );
+		}
+		return apply_filters( 'woocommerce_get_transaction_url', $return_url, $transaction_id, $this );
+	} 
+
 	/**
 	 * Get the order total in checkout and pay_for_order.
 	 *

includes/admin/meta-boxes/class-wc-meta-box-order-data.php

@@ -140,6 +140,12 @@ class WC_Meta_Box_Order_Data {
 
 		self::init_address_fields();
 
+		if ( WC()->payment_gateways() ) {
+			$payment_gateways = WC()->payment_gateways->payment_gateways();
+		}
+
+		$payment_method = ! empty( $order->payment_method ) ? $order->payment_method : '';
+
 		wp_nonce_field( 'woocommerce_save_data', 'woocommerce_meta_nonce' );
 		?>
 		<style type="text/css">
@@ -150,13 +156,24 @@ class WC_Meta_Box_Order_Data {
 			<input name="post_status" type="hidden" value="publish" />
 			<div id="order_data" class="panel">
 
-				<h2><?php _e( 'Order Details', 'woocommerce' ); ?></h2>
+				<h2><?php printf( __( 'Order %s details', 'woocommerce' ), esc_html( $order->get_order_number() ) ); ?></h2>
 				<p class="order_number"><?php
 
-					echo __( 'Order number', 'woocommerce' ) . ' ' . esc_html( $order->get_order_number() ) . '. ';
+					if ( $payment_method ) {
+						printf( __( 'Payment via %s', 'woocommerce' ), ( isset( $payment_gateways[ $payment_method ] ) ? esc_html( $payment_gateways[ $payment_method ]->get_title() ) : esc_html( $payment_method ) ) );
+
+						if ( $transaction_id = get_post_meta( $order->id, '_transaction_id', true ) ) {
+								if ( isset( $payment_gateways[ $payment_method ] ) && ( $url = $payment_gateways[ $payment_method ]->get_transaction_url( $transaction_id ) ) ) {
+								echo ' (<a href="' . esc_url( $url ) . '" target="_blank">' . esc_html( $transaction_id ) . '</a>)';
+							} else {
+								echo ' (' . esc_html( $transaction_id ) . ')';
+							}
+						}
+						echo '. ';
+					}
 
 					if ( $ip_address = get_post_meta( $post->ID, '_customer_ip_address', true ) ) {
-						echo __( 'Customer IP:', 'woocommerce' ) . ' ' . esc_html( $ip_address );
+						echo __( 'Customer IP', 'woocommerce' ) . ': ' . esc_html( $ip_address );
 					}
 				?></p>
 
@@ -217,20 +234,6 @@ class WC_Meta_Box_Order_Data {
 									}
 								}
 
-								if ( WC()->payment_gateways() ) {
-									$payment_gateways = WC()->payment_gateways->payment_gateways();
-								}
-
-								$payment_method = ! empty( $order->payment_method ) ? $order->payment_method : '';
-
-								if ( $payment_method ) {
-									echo '<p><strong>' . __( 'Payment Method', 'woocommerce' ) . ':</strong> ' . ( isset( $payment_gateways[ $payment_method ] ) ? esc_html( $payment_gateways[ $payment_method ]->get_title() ) : esc_html( $payment_method ) ) . '</p>';
-								}
-
-								if ( $transaction_id = get_post_meta( $order->id, '_transaction_id', true ) ) {
-									echo '<p><strong>' . __( 'Payment Transaction ID', 'woocommerce' ) . ':</strong> ' . esc_html( $transaction_id ) . '</p>';
-								}
-
 							echo '</div>';
 
 							// Display form
@@ -278,6 +281,8 @@ class WC_Meta_Box_Order_Data {
 							</p>
 							<?php
 
+							woocommerce_wp_text_input( array( 'id' => '_transaction_id', 'label' => __( 'Transaction ID', 'woocommerce' ) ) );
+
 							echo '</div>';
 
 							do_action( 'woocommerce_admin_order_data_after_billing_address', $order );
@@ -405,6 +410,10 @@ class WC_Meta_Box_Order_Data {
 			}
 		}
 
+		if ( isset( $_POST['_transaction_id'] ) ) {
+			update_post_meta( $post_id, '_transaction_id', wc_clean( $_POST[ '_transaction_id' ] ) );
+		}
+
 		// Payment method handling
 		if ( get_post_meta( $post_id, '_payment_method', true ) !== stripslashes( $_POST['_payment_method'] ) ) {
 

includes/gateways/paypal/class-wc-gateway-paypal.php

@@ -24,7 +24,6 @@ class WC_Gateway_Paypal extends WC_Payment_Gateway {
 	 * @return void
 	 */
 	public function __construct() {
-
 		$this->id                   = 'paypal';
 		$this->icon                 = apply_filters( 'woocommerce_paypal_icon', WC()->plugin_url() . '/assets/images/icons/paypal.png' );
 		$this->has_fields           = false;
@@ -32,6 +31,7 @@ class WC_Gateway_Paypal extends WC_Payment_Gateway {
 		$this->liveurl              = 'https://www.paypal.com/cgi-bin/webscr';
 		$this->testurl              = 'https://www.sandbox.paypal.com/cgi-bin/webscr';
 		$this->method_title         = __( 'PayPal', 'woocommerce' );
+		$this->view_transaction_url = 'https://www.paypal.com/cgi-bin/webscr?cmd=_view-a-trans&id=%s';
 		$this->notify_url           = WC()->api_request_url( 'WC_Gateway_Paypal' );
 
 		// Load the settings.