He also covers setting up a series of emails to go out after a client is booked, how to automatically send your W-9 form to a client who has paid you more than $600 so they can issue you a 1099, send an email to schedule a session ONLY if it isn't already confirmed, as well as sending an email to the person who referred you a job to thank them.
MailChimp Web Request:
IMPORTANT NOTE: For MailChimp, your api key with have a region ID at the end of it. It will be something like us1, us2, us3, us10 etc. You'll need put those same numbers at the beginning of your web request URL so it will be something like: http://us2.api.mailchimp.com/2.0/lists/subscribe....
API Documentation: https://apidocs.mailchimp.com/api/2.0/lists/subscribe.php
Chrome extension for POSTMAN to help you build and practice your API Web Request: https://chrome.google.com/webstore/detail/postman/fhbjgbiflinjbdggehcddcbncdddomop
Do you know if Madmini has an API? It looks like they do. Check out: https://madmimi.com/developer