Methods and devices for online payments are disclosed. Prior to accepting payment account information from a user for the payment transaction, a client terminal sends an interface listing command to a transaction server, requesting the transaction server to identify one or more acceptable input interfaces for receiving the payment account information. The transaction server responds to the interface listing command by a payment input instruction. The client terminal uses the payment input instructions to generate a payment information interface to present the one or more acceptable input interfaces for user selection. The user can choose how to input the payment information that best conforms to the user's expectations for security and convenience. The current method, device and system provide additional flexibility, improve efficiency, and facilitate online payment.