This is my first foray into WordPress Plugins. I would like to use the gform_post_submission hook to grab the data after the form is completed. Where do I place my integration code? From my research I can see two options, first to use the "exec_php" plugin so I can place my custom PHP code within the WordPress page. Second, to create a new template within the WordPress theme and add the custom PHP to this file. What is the recommended format for performing an integration?