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In Power Automate you can create a "When a HTTP request is received". Power Automate will generate a HTTP Post URL.
If you want to register a webhook subscription with the Power Automate URL as a notification URL you get the message "Service has not provided a valid validation token".
This is because Power Automate cannot send the validationtoken (perform the handshake) back to Business Central.
So for now you have to work always with an Azure function.

Is it possible that the handshake isn't needed for Power Automate?
Category: Development
STATUS DETAILS
Needs Votes
Ideas Administrator

Thank you for this suggestion! Currently this is not on our roadmap. We are tracking this idea and if it gathers more votes and comments we will consider it in the future. Best regards, Business Central Team