See #14 here - https://rizful.com/ -- actually we entirely built Rizful using Testnet3, but realized that if we rolled it out to users with Testnet3, we were in for big problems -- Testnet3 is so broken now that it's basically impossible to open and close lighting channels without MAJORLY tweaking various defaults.. fees are so high on Testnet3 that most node implemenations will actually fail to do cooperative closes! But we are very psyched to roll out Testnet4 support as soon as we can -- ideally next month. It's critical for the education use-case.