That said, one detail I left out is that this transaction is distributed across 4 separate systems, so it's not quite as simple as a database lock. And I wouldn't do a long db lock unless it was some kind of pessimistic offline lock :)
But we're mostly worrying about the mobile app acknowledging the response so the same principle stands - we need the mobile app to ACK :)
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Could you theoretically wait to commit database transactions until after the client has sent acknowledgement of the response?
Kind of, yup.
That said, one detail I left out is that this transaction is distributed across 4 separate systems, so it's not quite as simple as a database lock. And I wouldn't do a long db lock unless it was some kind of pessimistic offline lock :)
But we're mostly worrying about the mobile app acknowledging the response so the same principle stands - we need the mobile app to ACK :)