This is the main configuration class in the client application, which is annotated with @EnableOAuth2Client, as shown in the following code snippet:

@Configuration
@EnableOAuth2Client
public class OAuthClientConfig {
  @Autowired
  private OAuth2ClientContext oauth2ClientContext;

  @Autowired
  @Qualifier("movieAppClientDetails")
  private OAuth2ProtectedResourceDetails movieAppClientDetails;

  @ConfigurationProperties(prefix = "security.oauth2.client.movie-app-client")
  @Bean
  public OAuth2ProtectedResourceDetails movieAppClientDetails() {
      return new AuthorizationCodeResourceDetails();
  }
  @Bean
  public BCryptPasswordEncoder passwordEncoder() {
      return new BCryptPasswordEncoder();
  }
  @Bean
  public OAuth2RestTemplate movieAppRestTemplate() {
      return new OAuth2RestTemplate(movieAppClientDetails, oauth2ClientContext);
  }
}

The important aspect to look at in this class is that we initialize the OAuth2 REST template by providing the client details, which are configured in the application.yml file.