Student registration fee at conferences for ex-students for work done as a student I did some work as part of my final year undergraduate project and wrote a paper which has now been accepted at a conference. Though I am now working in the industry, I have listed my affiliation as my University because that is where I did my work as a student. So, for registering in the conference, do I have to pay the full registration fee (because I am currently not a student) or can I pay the student fee (because I did the work during my undergraduate days)?
You're not a student now

The fees are based on the status of the participants, not the status of the papers. Often, organizers will require some evidence of student status (such as a current student ID) in order to be eligible for the reduced price.

It may be reasonable to get the student fee if you're a student at the time of registration but graduate before the actual conference - as the process often takes multiple months, but if it's something earlier, then you're out of luck.