The BlueSnap Payment iOS SDK by BlueSnap allows API communication to implement payment features into eCommerce applications. It includes a link to download the kit, along with guides to integrate from download to initialization.
Square has launched the Register API for Android only a couple of months after releasing the API for iOS. The API allows developers to build end to end point-of-sale solutions that utilize Square's entire payment platform, or that integrate with third party infrastructure and applications.
The PayChannel API makes it possible to incorporate its credit card processing gateway into your software platform. Public information on the API is not available, though it does provide 8 payment features.
Celery, flexible ecommerce solution provider, allows users to accept pre-orders without charging the customer until the product is ready to ship. On the flip side, customers also have the capability to pre-pay for goods and services. In addition to flexible payment options, Celery allows developers to integrate its functionality with third party apps and workflows via the Celery API.