The Stripe PHP Library by Laravel Cashier facilitates an expressive interface to Stripe's subscription billing services. It allows for the handling of some boilerplate subscription billing code and basic subscription management, Features also include recogizing coupons, swapping subscription, subscription "quantities", cancellation grace periods, and PDF generated invoices.
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.