Here are the classes, structs, unions and interfaces with brief descriptions:

C OIDAuthorizationRequest	Represents an authorization request
C OIDAuthorizationResponse	Represents the response to an authorization request
C OIDAuthorizationService	Performs various OAuth and OpenID Connect related calls via the user agent or `NSURLSession`
C OIDAuthorizationService(IOS)	Provides iOS specific authorization request handling
C OIDAuthorizationService(Mac)	Provides macOS specific authorization request handling
C OIDAuthState	A convenience class that retains the auth state between `OIDAuthorizationResponse s` and `OIDTokenResponse s`
C OIDAuthState(IOS)	IOS specific convenience methods for `OIDAuthState`
C OIDAuthState(Mac)	MacOS specific convenience methods for `OIDAuthState`
C <OIDAuthStateChangeDelegate>	Delegate of the OIDAuthState used to monitor various changes in state
C <OIDAuthStateErrorDelegate>	Delegate of the OIDAuthState used to monitor errors
C OIDEndSessionRequest
C OIDEndSessionResponse	Represents the response to an End Session request
C OIDErrorUtilities	Convenience methods for creating standardized `NSError` instances
C <OIDExternalUserAgent>	An external user-agent UI that presents displays the request to the user. Clients may provide custom implementations of an external user-agent to customize the way the requests are presented to the end user
C OIDExternalUserAgentIOS	An iOS specific external user-agent that uses the best possible user-agent available depending on the version of iOS to present the request
C OIDExternalUserAgentIOSCustomBrowser	An implementation of the OIDExternalUserAgent protocol for iOS that uses a custom browser (i.e. not Safari) for external requests. It is suitable for browsers that offer a custom url scheme that simply replaces the "https" scheme. It is not designed for browsers that require other modifications to the URL. If the browser is not installed the user will be prompted to install it
C OIDExternalUserAgentMac	A Mac-specific external user-agent UI Coordinator that uses the default browser to present an external user-agent request
C <OIDExternalUserAgentRequest>
C <OIDExternalUserAgentSession>	Represents an in-flight external user-agent session
C OIDIDToken	A convenience class that parses an ID Token and extracts the claims but does not verify its signature. AppAuth only supports the OpenID Code flow, meaning ID Tokens received by AppAuth are sent from the token endpoint on a TLS protected channel, offering some assurances as to the origin of the token. You may wish to additionally verify the ID Token signature using a JWT signature verification library of your choosing
C OIDRedirectHTTPHandler	Start a HTTP server on the loopback interface (i.e. `127.0.0.1`) to receive the OAuth response redirects on macOS
C OIDRegistrationRequest	Represents a registration request
C OIDRegistrationResponse	Represents a registration response
C OIDScopeUtilities	Provides convenience methods for dealing with scope strings
C OIDServiceConfiguration	Represents the information needed to construct a `OIDAuthorizationService`
C OIDServiceDiscovery	Represents an OpenID Connect 1.0 Discovery Document
C OIDTokenRequest	Represents a token request
C OIDTokenResponse	Represents the response to an token request
C OIDTokenUtilities	Provides data encoding/decoding methods, random string generators, etc
C OIDURLSessionProvider	A NSURLSession provider that allows clients to provide custom implementation for NSURLSession