code: def new_sender(project_id):
      
  
      project = get_data_or_404('project', project_id)
  
      if project['owner_id'] != get_current_user_id():
          return jsonify(message='forbidden'), 403
  
      form = NewSenderForm()
      if not form.validate_on_submit():
          return jsonify(errors=form.errors), 400
  
      data = form.data
      data['project_id'] = project_id
      data['token'] = password_generator(40)
  
      id = add_instance('sender', **data)
  
      if not id:
          return jsonify(errors={'name': ['duplicated slug.']}), 400
  
      sender = get_data_or_404('sender', id, 'sensitive')
  
      return jsonify(**sender)
docs: Add sender.