added a sample plugin that can do the API query remotely.

Updated the API response to use JSON Encode and Decode.

license-manager/client-side/sample-plugin/slm-sample-plugin.php

@@ -28,6 +28,7 @@ function sample_license_management_page() {
     echo '<div class="wrap">';
     echo '<h2>Sample License Management</h2>';
 
+    /*** License activate button was clicked ***/
     if (isset($_REQUEST['activate_license'])) {
         $license_key = $_REQUEST['sample_license_key'];
 
@@ -48,14 +49,79 @@ function sample_license_management_page() {
             echo "Unexpected Error! The query returned with an error.";
         }
 
-var_dump($response);
+        //var_dump($response);//uncomment it if you want to look at the full response
+
+        // License data.
+        $license_data = json_decode(wp_remote_retrieve_body($response));
+
+        // TODO - Do something with it.
+        //var_dump($license_data);//uncomment it to look at the data
+
+        if($license_data->result == 'success'){//Success was returned for the license activation
+
+            //Uncomment the followng line to see the message that returned from the license server
+            echo '<br />The following message was returned from the server: '.$license_data->message;
+
+            //Save the license key in the options table
+            update_option('sample_license_key', $license_key); 
+        }
+        else{
+            //Show error to the user. Probably entered incorrect license key.
+
+            //Uncomment the followng line to see the message that returned from the license server
+            echo '<br />The following message was returned from the server: '.$license_data->message;
+        }
+
+    }
+    /*** End of license activation ***/
+
+    /*** License activate button was clicked ***/
+    if (isset($_REQUEST['deactivate_license'])) {
+        $license_key = $_REQUEST['sample_license_key'];
+
+        // API query parameters
+        $api_params = array(
+            'slm_action' => 'slm_deactivate',
+            'secret_key' => YOUR_SPECIAL_SECRET_KEY,
+            'license_key' => $license_key,
+            'registered_domain' => $_SERVER['SERVER_NAME'],
+            'item_reference' => urlencode(YOUR_ITEM_REFERENCE),
+        );
+
+        // Send query to the license manager server
+        $response = wp_remote_get(add_query_arg($api_params, YOUR_LICENSE_SERVER_URL), array('timeout' => 20, 'sslverify' => false));
+
+        // Check for error in the response
+        if (is_wp_error($response)){
+            echo "Unexpected Error! The query returned with an error.";
+        }
+
+        //var_dump($response);//uncomment it if you want to look at the full response
+
         // License data.
         $license_data = json_decode(wp_remote_retrieve_body($response));
 
         // TODO - Do something with it.
-var_dump($license_data);
+        //var_dump($license_data);//uncomment it to look at the data
+
+        if($license_data->result == 'success'){//Success was returned for the license activation
+
+            //Uncomment the followng line to see the message that returned from the license server
+            echo '<br />The following message was returned from the server: '.$license_data->message;
+
+            //Remove the licensse key from the options table. It will need to be activated again.
+            update_option('sample_license_key', '');
+        }
+        else{
+            //Show error to the user. Probably entered incorrect license key.
+
+            //Uncomment the followng line to see the message that returned from the license server
+            echo '<br />The following message was returned from the server: '.$license_data->message;
+        }
 
     }
+    /*** End of sample license deactivation ***/
+
     ?>
     <p>Please enter the license key for this product to activate it. You were given a license key when you purchased this item.</p>
     <form action="" method="post">
@@ -71,5 +137,6 @@ function sample_license_management_page() {
         </p>
     </form>
     <?php
+
     echo '</div>';
 }