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Custom webhook response not working?

Howdy, I’m trying to set up catching an API trigger from Slack. To authenticate, I need to respond to the payload received from Slack with the challenge information (Details: Using the Slack Events API | Slack). But nothing I put in “return data from API” seems to be recognised by Slack. Is there some other way of doing a custom webhook response?

Hi @oliphant! Try this response - worked for me: