Each customer who wants to check the licenses and fairness of your game providers has to contact all game providers? Instead of you simply give him all the required info? Are you serious?
No, enough just go to any game and check the exchange of information with the server and compare it with the original. If you are such an expert for whom you give yourself, then you should know how to do it...
I am an expert in regard to legal and investigative things and
not playing games!
As I do not play, how can I check the honesty of the games you offer? Do you claim to have a public provably fair system or can only players check it?