A friend of mine wants an eCommerce website and asked me to set on up using square (Squareup not squarespace). They would also like to have a custom email, like firstname.lastname@example.org. Is this possible to achieve using square? I don't think so, but I do hope so.
Square does not offer a domain registrar service, so you cannot obtain a new .com or .net address through their tools. However, you can add a Square online store to an existing custom domain.
This Square help article walks through the steps of configuring your DNS to point to a Square online store. After this is complete, you can set up custom email addresses through your domain registrar account.