I’m the PM on Chargeback Protection. Startups told us they don’t want to deal with the hassle and unpredictability of chargebacks; that’s why we built this. Happy to answer any questions you have.
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It looks trivial for the vendor to man in the middle attack.
I’d take my business elsewhere if presented with a UI from some random e-commerce site asking for extra personal information.
Attacker cannot know who you bank with. Plus, most of the time the confirmation screens are something like confirming 2nd/Xth characters of your password/date of birth.