Can I create a proxy for a private ArcGIS Online Feature Service

[JonnyDawe]

I am trying to understand whether the ArcGIS Online licensing allows me to create a proxy to attach credentials to requests to a private hosted feature service. 

An example use-case would be an application where we have implemented our own authentication and then want to supply secure data from our organisation to the user in the application. 

I can see that there is somewhat a mechanism to do this using the Esri Developer API keys, but the terms of use indicate that this cannot yet be used commercially: 

I would appreciate any insights or recommendations on the matter. For example what would the recommended mechanism be to achieve the above workflow? Thank you!

[John-Foster · Accepted solution]

The documentation was updated as of Nov 1 2023 you can now use API keys to access a private hosted feature service, but you can only do this with an ArcGIS Developer subscription. See https://developers.arcgis.com/documentation/mapping-apis-and-services/data-hosting/feature-services/... . Note you cannot access a private hosted feature service with API keys if you are using an ArcGIS Online account, in this case your option is to share the layer public.