Hello,
My business has a square register. I noticed that when I generate a receipt, customers get the option to enter phone number/email on the customer display.
Is it possible that before generating the receipt, while creating an order, they can enter more custom attributes on the customer display? I want to later fetch the custom attributes’ data along with other order data using Python SDK. Please guide me on how to achieve this.
Thanks
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Based on the information you’ve provided, the following documentation will help answer your question:
Additional Documentation
Custom Attributes for Customers
Using the Square Python SDK
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At this time with the Register collecting additional custom attributes on the customer display isn’t currently possible. We’re constantly working to improve our features based on feedback like this, so I’ll be sure to share your request to the API product team. 
@Bryan-Square Thanks for replying. How can I add custom order attributes to an already existing business if I’m not the business owner (developer.squareup.com/apps gives me 403 Only business owners can access the Developer Console)? Will the business owner’s Production square access token work?
In order to access the Developer Dashboard you’ll need to be either the owner or an employ with administrator permissions.
Hello @Bryan-Square . I have administrator permissions now. I have created custom item attributes from here https://app.squareup.com/dashboard/items/custom-attributes. But I cannot see these attributes on Square register when I checkout the items. I want to be able to enter these custom attributes when checking out the items. How do I achieve that? Thanks
What’s your application ID and the item_id that you added a custom attribute to?