Integration with Pusher Chat Webhook API (Authentication)

Hi,

To do a web API integration Appian require some authentication in the header of the request.

The webhook from a pusher has no way of editing the header but has both an app-key and a HMAC of the request body to validate that the webhook originated from Pusher.

Is there a way for me to provide verification to such webhooks on appian?

Many thanks,

Eric

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