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Stripe will offer interchange plus model so you are actually paying the real interchange rate + whatever they tack on for settlement probably 25 basis points and some fixed rate of 0.05 a transaction. You shouldn’t be paying a blended rate if you’re doing significant volume.

If you’re using a gateway, there are some that Handle tokenization so you never have to touch the PANs and you don’t have to worry about PCI levels and audits. There’s no reason your systems should be touching PANs unless you’re really large and using multiple payment processors for scalability and redundancy like if you need to process a million transactions in a few hours.