[certificate_student_name] : Displays Students Name
[certificate_course] : Displays Course Name
[certificate_student_marks] : Displays Students Marks in Course
[certificate_student_date]: Displays date on which Certificate was awarded to the Student
[certificate_student_email]: Displays registered email of the Student
[certificate_code]: Generates unique code for Student which can be validated from Certificate page.
[course_completion_date]: Displays course completion date from course activity.