Capture custom form data from the inventory items to mailchip or zapier

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I have setup a custom form (Product form) to collect some information, and collect a survey response before downloading (or buying) the digital product. How do I connect this form data to a storage such as Zapier or Mailchip?

I would love to be able to do this. As the feature is implemented now, it seems the Custom Form option appended to a product is missing a couple of features I want in a form. The primary one is the ability to share the data with another service or automatically export it.

Ideally, I'd like to populate a Google form with entries. I can do that with a regular form, but then it's not tied to the purchase.  How difficult or simple is that script to write?