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I am currently doing a credit-based system and encountered problem with using PayPal for the payment method. I know that I can redirect the user back to my page and I intend to make use of querystring to see if the payment was successful or not. If successful, the user should be able to see the change in his amount of credits.
Anyone know how I can go about to ensure security so that no one can abuse the system by typing in the querystring?
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