Abstract: A method is provided for mobile payment. The method is performed at a social networking system and includes receiving, from a first client device, a request to establish a prepayment account at the social networking system. In response to the received request, the prepayment account is established. The method further includes receiving a payment request from the first client device and, in response to the payment request, generating a unique identifier corresponding to the payment request. The unique identifier is sent to the first client device. The method further includes receiving, from a respective merchant, a transaction request that includes information corresponding to the unique identifier, a transaction amount, and an identifier of a user account of the respective merchant. The method further includes initiating transfer of the transaction amount from the prepayment account to the user account of the respective merchant.