I've been struggling to find documentation for my exact use case, and I was hoping someone here can point me in the right direction. I have a feature layer (which is not shared publicly) in ArcGIS Online, which I want to share with a client so that it can be displayed and queried on a map within their application. The client's application is not public, and is secured using their own authentication. They do not want the users of their app to see a second ArcGIS username & password prompt when the map loads the layer, nor do I want to provide them with a user name and password for our AGOL organizational account. I want to provide them with an API key, OAuth credentials, or implement some other authentication scheme so that their developers can add a map to their app, using the ArcGIS JavaScript SDK, which shows the layer I want to share with them, allowing the developers to handle authentication without any need for username and password input from the user. I have been reading through the ArcGIS documentation on authentication for OAuth2 and API keys, but I can't seem to find anything pertaining to this exact workflow. Is this even possible? If so, is anyone aware of relevant documentation from Esri on how to do this?
