code: def _collect_certificate_data(self, enterprise_enrollment):
          
  
          if self.certificates_api is None:
              self.certificates_api = CertificatesApiClient(self.user)
  
          course_id = enterprise_enrollment.course_id
          username = enterprise_enrollment.enterprise_customer_user.user.username
  
          try:
              certificate = self.certificates_api.get_course_certificate(course_id, username)
              completed_date = certificate.get('created_date')
              if completed_date:
                  completed_date = parse_datetime(completed_date)
              else:
                  completed_date = timezone.now()
  
              # For consistency with _collect_grades_data, we only care about Pass/Fail grades. This could change.
              is_passing = certificate.get('is_passing')
              grade = self.grade_passing if is_passing else self.grade_failing
  
          except HttpNotFoundError:
              completed_date = None
              grade = self.grade_incomplete
              is_passing = False
  
          return completed_date, grade, is_passing
docs: Collect the learner completion data from the course certificate.
  
          Used for Instructor-paced courses.
  
          If no certificate is found, then returns the completed_date = None, grade = In Progress, on the idea that a
          certificate will eventually be generated.
  
          Args:
              enterprise_enrollment (EnterpriseCourseEnrollment): the enterprise enrollment record for which we need to
              collect completion/grade data
  
          Returns:
              completed_date: Date the course was completed, this is None if course has not been completed.
              grade: Current grade in the course.
              is_passing: Boolean indicating if the grade is a passing grade or not.