To set up a webhook that will be able to post feedback results directly to Slack please follow the directions in this article: How to create an outgoing webhook?. The instructions below will walk you through the steps you need to take on the Slack side to be able to receive the incoming data from Mopinion.
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You can now specify what data must be sent, you can continue with step 4 of this article: How to create an outgoing webhook?.