Mailchimp & Squarespace Integration

Description

Mailchimp and Squarespace Integration:
We are looking to integrate Mailchimp with our Squarespace website to streamline our payment process and enhance our customer data management. Currently, we take payments on our website hosted on Squarespace, and each payment has a Student registration form that parents complete on behalf of their child. This form collects relevant details such as medical details, student name, student age, parent contact details, and more.
Our goal is to ensure that the information collected within the form is seamlessly integrated into Mailchimp, creating a new or adding to an existing contact record with the relevant details. We have successfully done a commerce integration between Squarespace and Mailchimp, which has allowed us to create a profile showing the product bought within Mailchimp. However, the problem is that it only brings across the payment information and doesn't include the registration form, which we need to see in Mailchimp. It seems to only show the email and name from the purchase.
Here's a product on our website you can see the registration form: https://www.ppas.uk.com/open-day/p/performing-arts
We are seeking a freelancer to help us resolve this issue and ensure that the registration form data is also integrated into Mailchimp. The freelancer should have experience with Mailchimp and Squarespace integration and be able to provide a solution that seamlessly integrates the registration form data into Mailchimp.
Please note that we do not require any contact information or placeholders in the description. We are solely seeking a description of the project and the freelancer's proposed solution.