Fraud Decision Processing System and Method

The present invention relates to a method and system for performing fraud screening and choosing whether to accept or deny an online transaction. The system includes a server that receives a transaction request and performs a first fraud screen based on transaction information of the requested transaction. The server further determines which operation to perform: whether to issue a final response right away (accept, reject) or whether to gather more information before issuing a final response. The first fraud screening may be a predictive fraud screening which generates a probability of fraud. The information gathering may be an authentication of the payment instrument. One aspect of the invention further provides selecting an operation flow based on the transaction information.