hi, thanks a lot! i built this with websockets and nodejs. a typical stack for real time applications. in the background i am calling functions of my lightning node to generate invoices and verify payments and so on. concerning the code, in this phase of the development i am not super keen on making it open source. I am sure there are some potential vulnerabilities that some bad actors would love to exploit. later on it's something i would consider though. maybe also collaborate with other programmers.