At this time we only support checking accounts and debit cards from US banks/credit unions as funding sources.
When you use a Privacy Virtual Card to purchase something online we automatically debit your checking account. We're hoping to roll out credit card funding, as well as other options, in the future.
Wait, I don't see debit card / checking account as an option when trying to add a funding source!
Reach out to us at firstname.lastname@example.org and let us know!