Remote Licensing System for EA or indicator

I would like a complete automated licensing system that I can integrate into my website to automatically email a licensing code to my clients after they make a payment for my MT4/MT5 EA or indicator.  

I am open to ideas, though I do have detailed specs (as for my Google doc) on the locking options for the license code, and dashboard I would like to have for managing licenses.  

The primary options would be: 

• I can add / remove / edit clients and products;
• I can stop (disable/enable) the MQL project from server;
• I can set a trial period for every client and product;
• I can lock to accounts, currency pairs, instrument timeframes

The dashboard would allow me to add/edit new licensee, and it would show me the licensee information for inactive and active users, such as customer name/email, product expiration date, last heartbeat, status, etc. 

I have Linux and/or Windows servers I can use for the project, and my website is in WP just in case you are familiar with making WP plugins.