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let's just say that customer A in bank 1 wants to send 1000$ money to customer B in bank 2. How do the banks make sure that this transaction is atomic?

I understand that inside the same database, we can use database transaction to ensure the atomicity. But how is that accomplished if it's cross applications?

Thanks

Ike
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  • Possible duplicate of [How does the banking transactions work "under the hood" - possibly in detail](http://stackoverflow.com/questions/4512547/how-does-the-banking-transactions-work-under-the-hood-possibly-in-detail) – Dan Bechard Feb 25 '16 at 21:52
  • they don't they settle the difference only at the end if day or whenever is convenient – HSBCOpiumtrade Jul 27 '18 at 15:05

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