Payleven, the Square equivalent for the world outside of the US, has launched an API to complement its mobile payment device. Prior to the API, use of Payleven's mobile payment device required downloading the Payleven app (similar to Square's current model). However, the API allows developers to integrate Payleven's functionality within third party apps.
Dwolla has adopted the Kotlin programming language, with a focus on helping its Java clients. Specifically, the company created a new Kotlin-based SDK for its API. Dwolla maintains that Kotlin is wholly compatible with Java and, more importantly, simpler to use and maintain.