Application integration for contactless payments is described. In an example, a payment making platform can provide a transaction code to a payment processing platform. The transaction code can be presented at a point-of-sale of a transaction between a customer and a merchant associated with the payment processing platform. Upon detecting an interaction between the transaction code and a computing device of the customer, the payment making platform and the payment processing platform can exchange data to enable the customer to participate in the transaction via the computing device of the customer. In some examples, the payment making platform and the payment processing platform can process a contactless payment for the transaction by transferring funds associated with an account of the customer from the payment making platform to the payment processing platform for depositing into an account of the merchant.