This GET endpoint is used to retrieve all stored user attributes for all destination token. You can use this endpoint to retrieve user attributes and provide personalized service to your users based on their preferences, demographic data, or other relevant information. To use this endpoint, you need to provide the user_token as parameters in the URL Path. The endpoint will then return all the stored attributes for the provided user in the context of the destination token. If multiple attribute set tokens are available, all the sets and their values will be returned.