[{'role': 'user', 'content': 'Analyze the following clause from a privacy policy and determine if it\'s fair or unfair. Also identify any privacy practices mentioned: If you purchase a "premium" or paid service, we or our third-party service providers will retain payment information for as long as is necessary to complete payment, plus any period of time thereafter that is required or permitted by law.'}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]