The present disclosure relates to systems, methods, and devices for facilitating payment transactions using an application program interface. In particular, the systems and methods allow payment providers to integrate with a social network and facilitates payment transactions by providing instructions to the payment providers based on the payment providers being integrated with the social network. For example, one or more embodiments identify a payment provider associated with a payment account of a user requesting to initiate a payment transaction. One or more embodiments then determine instructions to send to the payment provider based on transaction information and then send the instructions to the payment provider to cause the payment provider to process the transaction according to the transaction information. Additionally, one or more embodiments cause payment providers to communicate with each other for processing payment transactions involving users of the social network.