How to fetch incoming transaction in Ripple

How to fetch incoming transaction in Ripple

Currently I have setup ripple mainnet server and provide availability of XRP trading, If any user submits the transaction in his account from the external wallet, How I know which transaction performed? Currently, I have used WebSocket socket and subscribe all account to the listener, So when any transaction comes in subscribed account then it will catch the transaction. But the issue is that when my xrp server is down or listeners missed any transaction then how we fetch incoming transaction later.

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