Help! I'm getting an error setting up Slack

Questions
1

Help! I’m getting an error setting up Slack.
Hello, I’m an n8n developer in Japan.
In n8n, I created a Slack node under “Bot/Addmension,” completed authentication,
set the Webhook URL in Slack’s Enable Events, and even after several retries, I get the following error on Slack and can’t proceed. The Slack node is running and in standby mode.
[Your URL didn’t respond with the value of the challenge parameter.]
Even when I use a WebHook instead of a Slack node, I get the same error message. I keep getting the same error message.
Is there anything I can do?

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What is the error message (if any)?

Please share your workflow

(Select the nodes on your canvas and use the keyboard shortcuts CMD+C/CTRL+C and CMD+V/CTRL+V to copy and paste the workflow.)

Share the output returned by the last node

Information on your n8n setup

  • n8n version:
  • Database (default: SQLite):
  • n8n EXECUTIONS_PROCESS setting (default: own, main):
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2

When setting up a connection for event payload on Slack, first you have to register your webhook(If not using the built-in Slack trigger). This includes a challenge which Slack uses to verify webhook connections. They will send a POST request immediately to your webhook, and you must return the value under the field name ‘challenge’.

We’ll send HTTP POST requests to this URL when events occur. As soon as you enter a URL, we’ll send a request with a challenge parameter, and your endpoint must respond with the challenge value.

I added a Respond to Webhook node(refer to image) and used the default setting – respond with first incoming item. This made the verification successful on my Slack application.

image
image671×345 38.6 KB

Find more about the official Slack Trigger from here.

3

Thanks for your response.
I also successfully completed “Verification.”

However, I’m not sure what to do next and am having trouble.
Should I write the processing for the message notified by Slack after the response node?