If the student has paid for a re-enrollment on their certification program, there are two ways to confirm their payment:

1. Contact customer support to confirm the payment (in case it was paid with a different email or name).

OR 

2. Check in Zoho CRM in their certification account.

To check in Zoho CRM > Certifications for the payment, click on the contact name of the student.

On the left side column, click on Orders.

Orders will show everything that the student has purchased under this account.

You will see the date of purchase and the amount paid. Clicking on either of these will give additional details of the order. 

If the student purchased a re-enrollment, it will be shown there.

If it was not purchased, it will not appear. In this example, a reenrollment has not been purchased.