You don't need to buy a voucher, you should be able to book the exam online directly.

Use the links on this page:

https://www.vmware.com/education-services/certification/vcta-dcv-exam.html

Thank you very much for your fast responce.

I was confused by the developed/emerging countries https://www.vmware.com/education-services/certification/purchase-vouchers.html

I've booked the exam.

Thanks once more.

Can you please confirm, do we need any class id to write this exam?

@Gopal06 

The answer is in the link I already posted above, the training is “recommended” rather than “required”, so how you learn the content to answer the exam items is up to you.