Notes APIs use API-token only for authentication. You need to use "API-Token" as the header key and the api token that is shown in the Setting of Notes as the value.
To learn more about the configuration and usage of Notes, see Notes.
Note: The Collections Window, Notes, Advanced Payment Manager, Payment Plans, and Statement Generator features are entering end of support on June 3, 2024. For more information, please refer to the Product and Feature End of Support page.