License Manager for WooCommerce Integration with Child Themes via API -- 2

Hello, I am looking for help developing a child theme protected by license key (activation required to get updates). API DOCS here> [login to view URL] I was thinking about a different key per product and each product with two product variables for licensing: 1 year license and lifetime license. Can you please help write the required php files and make API connection? Also I would like to create a custom page like in the screenshot. Please let me know if you can help managing this. Thank you, Ric