Hi
I have a Zap that takes input from a HubSpot and then uses a POST via a webhook to a separate web app that I have built.
When I execute the POST step I get the error
“Failed to create a request in Webhooks by Zapier
The app returned “Unknown action: null””
I have attached screenshot

After checking my web app, it seems to be expecting an “action : create_contact”. When the webapp receives the contact detail from the Zap it will create a contact in its own database.
The web app is expecting the following payload format

As you can see it is expecting an action at the beginning but I don't know how to configure that in my Zap.
Here are the rest of the Zap settings from above

When I send data from the Web App to a different Zap, it works perfectly. So the connection from WebApp to a Zap is good, but not the other way round with this example.
Any ideas?
Thanks in advance