Shopify customer list and Mailchimp

Question

Is it possible to create a sign up form that sends the customer's details (email address, name, etc.) to both my Mailchimp account's mailing list and my Shopify store's customer list upon submission?

Answer 1

You can find information about creating Customers to Shopify in their API:

Creating a new customer

You can also find information in how to add a member to a list in MailChimp's API:

Adding a new member to a list

Answer 2

This app lets you add your customers(who sign up for marketing) automatically to the mailchimp list. You can add a field in the form which will add all users to the marketing list of shopify and then automatically to the mailchimp list.