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Connect front/back to the authentication system
As commented mentioned at the beginning of the post, to integrate an application with this authentication system, Oauth2 will continue to be used, with the authorization code flow, so that the application will redirect to the IM, which will then read the client certificate if it has one configured, and will return a JWT token to the original application.
There are libraries to configure this type of flow for both Spring Boot and Vue JS, and it you will be necessary need to configure a series of parameters such as:
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