Hello aazard!
Nice to meet you and welcome to the Huawei Enterprise Community!
You can check the prizes available for exchange in the Rewards section. I am not sure if there are certification vouchers available at the moment, but If you are interested in getting certified my advice is to first start learning and getting familiar with the exam content here in the Community.
If you are interested in a particular exam or technology, let us know and we can suggest some resources to begin your exam preparation.