The migration is related to PAX CGO MISC and UATP transactions.
The certification process is to test the compliance of the files generated out of an airline system.
Each airline will have to run is own certification regardless if they use the same system.
All the different user of Rapid will have to pass the certification process, the fact that EK will have done it earlier will only ease the compliance of the other users.
So you will have to generate real file for passing certification process for all of your customer and not fake the test file just by replacing the airline from EK to any other.
We need testing made on real data in the real environment of the customer otherwise the certification process will not have much value.
Also this is why we do not certify system but Airlines.