I recenter set up Optin Monster on our website. Currently I have them pushing to a landing page to collect their info. I would like to have individuals just fill in their email address on the pop up. I have connected the API on their side. How do I have Marketo capture that form fill? Is it a web hook? Looking for general guidance.
Webhooks are outbound calls from Marketo.
Presumably you're looking for the API lead creation activity, which will only happen with a Lead Was Created w/Source = API.
I wouldn't use the OptIn Monster integration. Just put a Marketo form in your OptIn. That gives you full Filled Out Form and web session tracking which you won't get otherwise.