question, how would I handle Product->Paypal->Purchase->Mysql_add_credit->update_table


So, a customer buys "Credits/Points" he'd go to the website, login. Click Buy Credits, then hed be directed to a paypal page to pay for the credit ammount he desires . I got that far now I need a method to update his credit count in the database. I can have him redirected to http://www.site.com/purchase/success...edit&ammout=40. But heres the problem... if he refreshes he can add credits with out paying or he can set http://www.site.com/purchase/success...ammount=400000 and give himself as many credit points as he wants! grr im stuck

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