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Connecting Nintex form for Office 365 to external API's (Google-with OAuth2 authentication)

I like to use Nintex forms because I really love how the cascading dropdowns work.  I was wondering, is it possible to connect to an external API (google api's with two-factor authentication) and pull the data to a list and use that list to create a Nintex form with cascading dropdowns and I get fresh data from the API whenever I use the form.
Is this possible?  If so, are there any resources that I can read and research?
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