Hello We are small company , but last days some people wannt refund for him money (Paypal Accounts). They say dont know us site and dont really use it and pay for it. We think maybe we need a call-back-verification service for the lowest price. The system on us site give user and pass auto generate when user pay. The user and pass its recive by him paypal mail. User its from him names on paypal , passwords its random generate. Can some one say him advice. We find this sites. http://www.telesign.com/solutions.asp http://www.varilogix.com/products/ http://www.maxmind.com/app/telephone_buynow The bot call on phone and say number. Maybe this is the right way ? Or maybe we must say will not make and refund ? Thanks!