Systems and methods for providing multi-platform, in-application payments include transferring funds, by a payment service provider device, from a funding source to a payment account in response to receiving a first fund transfer instruction from one of a first user device and a second user device over a network. The payment service provider device then associates the payment account with a first platform application in response to receiving a first association instruction from the first user device over the network, and associates the payment account with a second platform application in response to receiving a second association instruction along with the user account information from a second user device over the network. The payment service provider device will pay for each of a first in-application purchase associated with the first platform application and a second in-application purchase associated with the second platform application using the payment account.