it doesn't always work though. Some companies can detect if you're using temporary credit cards and won't let the txn go through. Frustratingly it's often the ones that I would like to use it with the most.
I am curious if the card #s I can get directly from Citi might work but haven't tested it out. Those are a pain to generate compared to privacy.com though.
The first 6–8 digits of a credit card number represent the issuer (IIN, see [0]). Merchants can perform a lookup of those first few digits to their own denylist. Citi’s IIN for temporary cards should (in theory) be the same IIN used to issue non-temporary ones.
I am curious if the card #s I can get directly from Citi might work but haven't tested it out. Those are a pain to generate compared to privacy.com though.