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What payment processing system are you using? Verisign Pay Flow Pro has an undocumented feature that you can call tech support to turn on the allows you to assign a unique number to the transaction ahead of time and they will not process a transaction with that number twice. I think they call it "duplicate detection".
Otherwise you may consider doing something similar in your app: Create a unique ID, put it in a hidden field on the form, write it to the database on submit, but check first to see if it has been written to the database before you actually run the credit card.
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Expert:
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lclbus
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Date:
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Aug 18, 2006
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Time:
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23:17
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