Device flow with querystring parameters

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You can send extra data in the request body in the Client Credentials flow. You can create a client credentials Action:

exports.onExecuteCredentialsExchange = async (event, api) => {
  api.accessToken.setCustomClaim("https://my-api.exampleco.com/example-claim", event.request.body.example);  
};

And add the Action to the Machine to Machine flow in your Auth0 Dashboard (Actions > Flows).

When you request a token, you can include any data in the request body:

curl --request POST \
  --url 'https://your-domain/oauth/token' \
  --header 'content-type: application/x-www-form-urlencoded' \
  --data grant_type=client_credentials \
  --data client_id=YOUR-CLIENT-ID \
  --data client_secret=YOUR-CLIENT-SECRET \
  --data audience=YOUR-API-IDENTIFIER \                                  
  --data example=true \   // <-- extra data