Vapi to Zapier, back to Vapi

To whom it may concern, I’be created a tool using Zapier that cross checks Go High Level to see if a contact exists or not (using the contacts phone number).

However, at the end of the zap I need to send that information background Vapi so my voice agent knows whether or not the contact exists, but I can’t find the right endpoint to send that information back to.

At the moment I’m using this endpoint: https://api.vapi.ai/v1/assistants/aae731b2-3a05-477c-9397-fc300c2d46d2/webhook

But I keep getting this error response when trying to POST back to the endpoint.

Any help would be greatly appreciated.
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