Square now supports Notes and files on customer profiles, including multiple timestamped notes, but these newer notes do not appear to be exposed through the Customers API. Add file attachments and notes to customer profiles | Square Support Center - United States
The API currently only provides the existing single note field on the Customer object which outdated version of notes and do not show new notes described above .
It would be very useful to add API access to:
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Retrieve customer notes
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Create, update, and delete notes
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Access note timestamps and author information
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Receive webhooks when notes are added or changed
Our use case is we are building integration and usually customer notes has very useful information about customer that is being lost during APIs which we want to highlight and do notifications when new notes are added.
Exposing the newer Notes and files functionality through the API would make customer profile integrations much more complete.