The OAuth application credential generates a short-lived access token that gives your application permission to access ready-to-use services, such as basemap layers, geocoding, and routing, in ArcGIS. It is important to treat client secret as you would your password. You must keep it confidential and we recommended not storing in your application.
The length of time a token credential remains valid. Represented in minutes. If not explicitly set, the server default is used. If unspecified, the server returns a token with an expiration interval of 120 minutes (2 hours). The server default for the maximum allowed expiration time is 20160 minutes (14 days), but this value can be configured on the server.
The URL by which the root of a server is accessed. This is the URL against which rest endpoints are resolved. For example, "https://sampleserver3.arcgisonline.com/ArcGIS/rest/services/SanFrancisco/311Incidents/FeatureServer/0" would have a server context of "https://sampleserver3.arcgisonline.com/ArcGIS", on which we could add "/rest/info" or "/rest" to fetch the server information.