How can I locate my callback URL for my form?

After an individual completes my survey, I'd like to have jot form send that user's information (Name, Email, etc) back to Mailchimp so they are removed from the distribution list. Where can I locate my callback URL and what is the process of setting this up? Thanks!

I'm not sure if you are referring to the thank you page or the Custom URL in the thank you page. Can you please check this guide if this is what you are looking for http://www.jotform.com/help/211-Setting-Up-the-Thank-You-Page.