Transaction identification is described. A payment processing platform can receive (i) transaction data associated with a transaction between a merchant and a customer and (ii) a transaction code from a payment making platform. The payment processing platform can receive an indication of an interaction between a computing device of the customer and the transaction code, wherein the indication is associated with context data associated with the interaction. Based at least partly on comparing the transaction data with the context data, determining that the customer is associated with the transaction and causing an association between the customer and the transaction, wherein the association causes at least a portion of the transaction data to be provided to a mobile payment application, associated with the payment making platform, on the computing device of the customer.