[heavyset_go]

Wasn't aware of this, I've had payments denied because of simple typos in my name on the card or in my billing address.

[rsync]

If it is Visa/MC there is no validation of first/last unless an additional verification step is layered on top by your bank. "Verified by VISA" is one example.

They can, and do, validate on street number and/or zip code so you can certainly error out on typos there ... but not name.