I have been using CND for years and I am only a home user. Doing my own and friends and family nails is my hobby. I have started using Gel Bottle product and I absolutely love it and prefer it to CND. The costumer service is very friendly and if there is an issue they do try to solve it as soon as they can. We are all humans and we all make mistakes.
I can buy CND, Gelish, OPI and other big brands on various websites and they don't ask for certificates so I don't see why Gel Bottle should do so. If all the big brands asked for certificate, people like me would not be able to use them and have a lovely hobby doing nails ;-)