Hi, @The_Fourth_Box, thanks for reaching out with your query and welcome to the Seller Community!
I've just tested shipping on my own Square Online site and can confirm that only the Shipping Address is required to complete an order online. You are not prompted to enter a separate Billing Address as part of the Square Online checkout flow.
Just so I'm on the same page with you here, would this situation come up if a customer is ordering a product from your site as a gift for another recipient? Further to this, is the reason you would need to contact the customer who placed the order to confirm specifications for the order (such as flavour, colour or unique message)?
If so, the workaround here would be to incorporate modifiers to your items that require a response in order for a customer to proceed to checkout.
If this suggestion isn't helpful, please include some more information in your reply and I'll do my best to assist.
Laurie
Community Moderator, Australia, Square
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