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> Walmart is currently trialing it to save $3B-$7B a year in interchange fees. No crypto, just XML messages through a mainframe at the Federal Reserve with a 20
by SpicyLemonZest 9d ago
> Walmart is currently trialing it to save $3B-$7B a year in interchange fees. No crypto, just XML messages through a mainframe at the Federal Reserve with a 20 second SLA.
Please tell your user that this SLA is much too high for many purposes. A cafe or such would lose a ton of money if every transaction took 20 seconds longer to conduct.
- toomuchtodo 9d agoWorks fine based on the evidence. It’s a maximum SLA, not every transaction. The economics are too compelling to ignore. Fast enough.
- pocksuppet 9d agoIt's the worst case before they get penalized. I've had worse times with Mastercard and Visa. It's really not a big deal if one in a thousand payments, you sit by the card reader for 30 seconds before it says "please try again".