plugin development – Registration Forms

My current configuration of WP

Theme used: Hope
Extensions in Place: Easy Registration Forms, Gravity Forms
Website address: https://fegu.org

Issue (s) encountered: I am developing a mini site that will allow students to register and send me their report cards; However, once a student is registered in my database, I would like that he / she can automatically receive a registration code. Thus, when sending his report card, he will simply be asked to enter his registration code (the latter contains this information, name, surname ……). .). once the registration code has been entered, he has the option to send his ballot.

Please, I have not been able to do this for almost two weeks. I did not do it with Gravity Forms, no results, I did it with Easy Forms (https://fegu.org/enrolement/) as if I really needed you.

Thank you!