Avast secure vpn

Hi, I have a problem with payment in avast Secure VPN and I received a message that I was not sure of the payment process, although I had already purchased from avast the same card and I purchased the registration key from a store and was activated but not registered in my name

How do I register the activation code in my name?
It is only numbers

Thank you

https://support.avast.com/article/24/ (Orders/Renewals/Refunds)