Hi @aamag !
The answer is similar to that in your other Pipedrive query … you need to add a filter on the path from the Webhook to compare the current and previous values, and only continue when the Contact Type field has changed.
I’m also guessing you may also be able to use the New Person Event module rather than a Custom Webhook - that saves you having to manually create the webhook in Pipedrive, and makes the scenario more understandable and maintainable for anyone else.