Woocommerce: Managing software subscription API

I have an application VB.NET Forms app that I want to charge for the use, on a subscription basis.

How can I set this up with a wordpress site?

E.g. user registers on the site, purchases a subscription, then log in with the same details on the app which checks the subscription.

You will need to install WooCommerce free plugin and buy a subscription plugin for woocommerce:

• Subscriptio - WooCommerce Subscriptions (the cheapest)
• WooCommerce Subscriptions (more expensive)

Then you can bridge it through WooCommerce API v3 VB.NET / C# library.
(This part will be a little more difficult).