code: def to_representation(self, instance):
          
          updated_course = copy.deepcopy(instance)
          enterprise_customer_catalog = self.context['enterprise_customer_catalog']
          updated_course['enrollment_url'] = enterprise_customer_catalog.get_course_enrollment_url(
              updated_course['key']
          )
          for course_run in updated_course['course_runs']:
              course_run['enrollment_url'] = enterprise_customer_catalog.get_course_run_enrollment_url(
                  course_run['key']
              )
          return updated_course
docs: Return the updated course data dictionary.
  
          Arguments:
              instance (dict): The course data.
  
          Returns:
              dict: The updated course data.