code: def get_program_course_keys(self, program_uuid):
          
          program_details = self.get_program_by_uuid(program_uuid)
          if not program_details:
              return []
          return [course['key'] for course in program_details.get('courses', [])]
docs: Get a list of the course IDs (not course run IDs) contained in the program.
  
          Arguments:
              program_uuid (str): Program UUID in string form
  
          Returns:
              list(str): List of course keys in string form that are included in the program