I don't think I understand. Why would I need to pass the entire lead record?
Every time a lead comes in, I need to strip the domain name (say qwerty.com), send it to an external service (let's say Zapier) and look up this lead's domain name (qwerty.com) against an existing list of domain names. If this qwerty.com does not exist on the list, then I receive a "False" response which would trigger some actions (is Marketo capable of listening for a response and reading the response?). And then qwerty.com needs to be added to the list of domain names so the next lead from qwerty.com is not recognized as a "new" domain name.
How do I automate updating the list of domain names on Zapier?
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