added log for refund cutoff date

common/djangoapps/student/models.py

@@ -1571,6 +1571,11 @@ class CourseEnrollment(models.Model):
         # If it is after the refundable cutoff date they should not be refunded.
         refund_cutoff_date = self.refund_cutoff_date()
         if refund_cutoff_date and datetime.now(UTC) > refund_cutoff_date:
+            log.info(
+                u"user [%s] cannot be refunded because his/her cutoff date [%s] has passed",
+                self.username,
+                refund_cutoff_date
+            )
             return False
 
         course_mode = CourseMode.mode_for_course(self.course_id, 'verified')