OpenAPI

I am trying to create an email that will go to an non Appian user.  I am putting 2 links/buttons in the email for them to click and in turn would like it to start a process.  First, is this even possible?  Second, in my HTLM code, do I set mode to cors or no-cors?  Third, where do I put the authorization in the HTML code?  I set up a service account in the admin console and added it to the user group.