A OpenEdge certification would be so funny! If it anything like the licensing it would be a incomprehensible mess . You would get Certification Agent or Named User Certification . If your company has more then 50 programmer then you need a enterprise based certification that would offer a few more option but would cost 10x the price by programmer. Then you would have a progress certification maintenance fee each year that would be about 10% of your certification and if you don't pay for a few year , you would need to pay back all the maintenance that wasn't paid and a fee to get back your certification ....
Of course with all this , progress would setup no way of verifying certification and it would be based on the programmer good faith... Maybe they would setup a certification .lic file that would collect incomplete information on certified programmer so that it can be used by sales rep to blackmail people in paying more for the certification!