TDL Licensing Add-on Development

I need a compact TDL add-on built for Tally that focuses purely on licensing and validation. The add-on must talk to our own software, exchange keys, and keep subscription status in sync every time Tally starts or a licence-related action is triggered... (Budget: ₹100 - ₹400 INR, Jobs: API Development, Database Management, Documentation, HTTP, JSON, RESTful, Software Development, Software Engineering, Technical Documentation, Web Services)