Abstract: Methods are disclosed of processing financial transactions. A connection is established over a public network between a customer client and a merchant server. A file is received over the connection from the merchant server at the customer client. An application is launched at the merchant server in response to receiving the file. Financial transaction data are received with the launched application. The received financial transaction data are transmitted with the launched application over the connection from the customer client to the merchant server to initiate processing of the financial transaction with the received financial transaction data.