CoursePress Pro, WooCommerce & Mailchimp

I am trying to properly set up a course so that the purchase triggers a change in a MERGEFIELD on Mailchimp, which will then trigger an e-mail automation. But I keep on running into roadblocks.

I’m prepared to manually set the date of the course in Mailchimp so that the e-mails get sent out, but I’d really like to automate the whole process.