How Do Visa/Mastercard Gift Cards Work?

Hi,

How does it work when using a visa or mastercard prepaid gift card to buy monero? Suppose I buy a gift card with cash, can I buy it anonymously? Do I then share some details from the card with the seller or must I give the seller the physical card itself? What info would the seller need?

Thanks for any help.

youll share pix of the card and receipt with other trader