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Has anyone successfully set up Slack Event Subscriptions?

Hey folks, so I’m interested in the Slack event subscriptions functionality (it triggers a webhook when a certain thing happens, eg an emoji is use, or a person joins a channel).

To set it up, you have to initialise it with a challenge, which I’ve done successfully:

But now what I need help understanding is how can you get the payload data when a thing happens. EG - a person joins the team in Slack:

It should send some data like this:

Which I could happily figure out how to parse, but where is that data being sent??