json encode after filter, fix getting started link

Author: rajumsys

admin.widget.class.php

@@ -87,7 +87,7 @@ public function test_email_sending($recipient, $debug = false)
                 $this->render_message('Test email sent successfully', 'updated');
             }
         } else {
-            $this->render_message('Test email could not be sent.  Please check your plugin settings and refer to <a href="https://support.sparkpost.com/customer/en/portal/topics/770787-getting-started/articles" target="_blank">Getting Started</a> in the <a href="https://support.sparkpost.com/" target="_blank">SparkPost Support Center</a>.');
+            $this->render_message('Test email could not be sent.  Please check your plugin settings and refer to <a href="https://support.sparkpost.com/customer/portal/articles/2670627-sparkpost-new-user-guide" target="_blank">Getting Started</a> in the <a href="https://support.sparkpost.com/" target="_blank">SparkPost Support Center</a>.');
         }
     }
 

mailer.smtp.class.php

@@ -22,7 +22,7 @@ public function configure_phpmailer($phpmailer) {
             return;
         }
 
-        $tracking_enabled = (bool) $settings['enable_tracking'];
+        $tracking_enabled = $settings['enable_tracking'];
         $x_msys_api = array(
             'options' => array (
                 'open_tracking' => (bool) apply_filters('wpsp_open_tracking', $tracking_enabled),
@@ -39,7 +39,7 @@ public function configure_phpmailer($phpmailer) {
         $phpmailer->Username = 'SMTP_Injection';
         $phpmailer->Password = apply_filters('wpsp_api_key', $settings['password']);
 
-        $json_x_msys_api = apply_filters('wpsp_smtp_msys_api', json_encode($x_msys_api));
-        $phpmailer->addCustomHeader('X-MSYS-API', $json_x_msys_api);
+        $json_x_msys_api = apply_filters('wpsp_smtp_msys_api', $x_msys_api);
+        $phpmailer->addCustomHeader('X-MSYS-API', json_encode($json_x_msys_api));
     }
 }