I have a client request to use adaptive card in MS Team as a front-end for some business process. They have their own business servers. I would like to try to achieve that without having to build a chat server, is it possible to have Adaptive Card submit form inputs to an arbitrary server, preferably being able to set the URL endpoint when I call the Graph API to send the card in the first place?
Posting the Answer for better knowledge
Copying from @Tim Cadenbach comments
Technically...thats what you do. You configure an App and a Bot registration. The Bot registration has a url where it sends the data to. The server you point it to can be anything as long as you format the responses that MS Teams can understand them. You don't have to use the botframework it just makes things a shitton easier.