To extract the user information from the JWT identity mapping, capture the value assigned to HEADER NAME. It's the name of the header to use when sending the signed JWT to the ASE.

Assign the value of Header Name to the location key in the jwt object of the API JSON file. For more information on configuring the API JSON file, see Defining an API using API JSON configuration file in sideband mode.

"jwt": {
            "location": "h:X-Identity",
            "username": "username",
            "clientid": "client_id"

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