text: import os
  from flask import Flask, Response
  from twilio.jwt.client import ClientCapabilityToken
  
  app = Flask(__name__)
  
  
  @app.route('/token', methods=['GET'])
  def get_capability_token():
      """Respond to incoming requests."""
  
      # Find these values at twilio.com/console
  # To set up environmental variables, see http://twil.io/secure
      account_sid = os.environ['TWILIO_ACCOUNT_SID']
      auth_token = os.environ['TWILIO_AUTH_TOKEN']
  
      capability = ClientCapabilityToken(account_sid, auth_token)
  
      # Twilio Application Sid
      application_sid = 'APXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX'
      capability.allow_client_outgoing(application_sid)
      token = capability.to_jwt()
  
      return Response(token, mimetype='application/jwt')
  
  
  if __name__ == "__main__":
      app.run(debug=True)
  