Looking for advice on setting up a 30 day fitness program for purchase through Squarespace site

Hi there!  I work for a fitness influencer, and we have been setting up her website on Squarespace.  She has also been working on building up her email list on Mailchimp.  She would like to introduce a 30 day fitness program that customers would purchase on Squarespace and then they would receive daily emails for the program through Mailchimp. I have been wracking my brain on how to make this happen automatically without having to manually add people who purchase the program to a Mailchimp segment/tag myself, but haven't been able to find a solution.  I looked at what zapier was able to do, but the only option for a squarespace zap was when a lead submits a form.  Does anyone know of any possible way to automate signing a customer who buys a specific product on squarespace up on a specific segment/tag on Mailchimp.  Or is there a way to do this through Squarespace email marketing?  Is there a way to automate if they purchase a certain product that it goes through a specific email journey that other customers wouldn't go through.  I hope this all made sense. I am completely self taught on all things websites so I will admit my vocab in this area is lacking.  If anyone has any suggestions for how to make this work, I would so greatly appreciate it.  Thank you!!!!