I am receiving a response from PP for a payment, which i then determine what happens with that transaction. I understand if it has SUCCESS then the payment is fine but what fields from the response could i check against values from my database to ensure the transaction hasnt been tampered with?
As you never mentioned what type of transaction you've been conducting, I can't make a more specific response, but I would recommend using the "custom" variable to pass a value within the transaction request and which can be queried by conducting a GetTransactionDetails API call.
