The Yandex Money iOS SDK by Yandex is the official Objective-C implementation by Yandex. This SDK calls the Yandex Money API which provides the developer with an online payment system and allows selling and purchasing of goods and services. Developers need to obtain a unique client ID. Yandex is an Internet company and the largest Russian search engine.
At TwilioCon in San Francisco today, Twilio is unveiling a new billing system for its API. This new in-app billing solution is called "Twilio Connect," and it provides a much simpler model for developers to implement customer billing when it comes to recurring charges for SMS and phone calls.