[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.
[certificate_student_photo]: Displays Students pic
[certificate_course_duration]: Students time spent on course