What was your motivation for attending training courses and gaining certifications? I assume that since you paid for the training out of your own pocket, that you were interested in the subject and that you now feel qualified. Doesn't it give you a certain sense of pride that your employer is suddenly interested in your achievements?

I doubt that your employer can force you to present proof of any qualifications that were not required when you were employed. If however you claimed to have certain qualifications when you applied for the job then it is only reasonable that the employer should see them. In the mean time, discussing which qualifications are relavent to the exercise, will give you a great opportunity to discuss your current situation and future plans.

bon chance!