WordPress customization

Hello, I would like three things, please tell me if you misunderstood, I use google translate :) I created a wordpress theme, I sell plugins for this theme, so I use easy digital downloads with their add-on software licensing. 1. I would like to integrate software licensing directly in the panel of my theme, ie, when a customer to install and activate a plugin on its site, a "Licenses" section in the panel where it can enter the license of the plugin installed, you can install from several plugins, so many licenses can be entered. 2. Always with EDD, I've created like this site: [login to view URL], a priority support page, the buttons were created with EDD, I would like to know how to display a form gravity forms instead of the price table, when a user to purchase priority support. Beware, the priority carrier on a date, 1 year or 45 days, so when the date has expired, the client can not access the form within renew purchase. 3. For my support page, I would like to do the same thing EDD: [login to view URL], if you click the "Submit Support Request" button, an input appears where you must enter a word eg "google", and links to documentation created with helpscout appears, I managed to do the same thing on my site, but when I hit a word in the input, I get an error in the console "No 'Access-Control-Allow-Origin' header is present on the requested resource", yet I entered the following code into my [login to view URL] file: add_action( 'send_headers', 'add_header_acao' ); function add_header_acao() { header( 'Access-Control-Allow-Origin: *' ); } Well, can you tell if you understand me and how much would cost? Thank you very much :)