If we set a custom attribute for an order (Custom Attributes for Orders), does this appear under the Order’s detail view when looking at the order from the Square POS?
If yes, can you share a screenshot of how this would reflect?
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Based on the information you’ve provided, the following documentation will help answer your question:
Additional Documentation
Custom Attributes
Add Custom Attributes
Define Custom Attributes for Orders
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At this time the custom attribute isn’t visible in the POS on the order. 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. 
Hi Bryan,
Thanks for the response.
Does it appear on reports, or anywhere in the Square web portal?
Or is it just purely for developers to use to store custom data for their use only for now?
Currently, the custom attribute is only available with the API response.