A method, system, and non-transitory computer readable medium for transaction processing based on a real-time conversation are disclosed. A chat-based ordering method includes displaying a chat user interface (UI) for a first product on a service page for displaying information associated with the first product, creating a chat room for a chat between a seller associated with the product and a user in response to a selection on the chat UI on the service page, and providing an ordering capability for at least one of the first product and at least one second product through the chat room, wherein the providing includes displaying or linking information associated with the first product on the chat room.