fraud with payments

blcksys
Contributor
Contributor

I wanted to integrate paypal express checkout into my service, but, what concerns me is: what prevents users from defrauding the system and modifying amounts?

I give an example:

  1. user come to my service and click to purchase XYZ for 9,99$

  2. user alter the POST request and set payment to be 0,09$ instead

  3. get redirected to paypal website -> now the amount he has to pay is 0,09$ instead of 9,99$

  4. he pays -> get redirected to my service as success payment

  5. he got a product worth 9,99$ by paying 0,09$ defrauding the system

So, how exactly you prevent that?

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