'Where does the API call from the interactive card in Google Chat go?

I am trying to replicate examples from the Google Docs about Creating interactive cards in Google Chat. I have created a sample link in my card.

Sample card with a link "click me"

But once I hit "click me" I have no idea where the request goes and how to steer that it's routed to my publicly available Node.js express route on Google Cloud run.

I must have missed something about the basic bot communication. Can you help me? (Background. I am sending my card via a simple webhook at this point.)



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