Discover what a token exchange is and how to configure it in a Spring Boot application.

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Spring Security 6.3 adds first-class support for OAuth 2.0 Token Exchange (RFC 8693), enabling microservices to exchange an existing access token for a new one scoped to a different audience while preserving the original user identity. The guide covers configuring a resource server to act as both a server and an OAuth 2.0 client, setting up TokenExchangeOAuth2AuthorizedClientProvider, configuring Spring Authorization Server 1.3 to accept token exchange requests, and wiring everything together with RestClient. A complete end-to-end test demonstrates a user logging in, calling user-service, which exchanges the token to call message-service on the user's behalf.

A Guide to Token Exchange in Spring Security