Okay so I have a credits system where users have to buy credits through Google Checkout. So what I need is when someone buy's from Google Checkout and the order is complete (not cancelled), it will edit and update one of the tables in my MySQL. The table name is "credits" and it is numeric which means it should and only contain numbers. If for example a user buy's 10 credits and after the payment is complete (not interrupted or cancelled), it automatically will update the user's credit number by adding however many credits they bought.
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