At the moment, the scan code generator doesn't support some channels that it can.
Twilio WhatsApp: Just like regular WhatsApp
LINE Profile Link (QR Code):
Skype Add Contact Link (QR Code): https://join.skype.com/bot/bc7229da-470f-4d2f-9f12-9fa966a9c24b (App ID)
Web Chat Link (QR Code): Link to one of the given Website URL's (dropdown)