The Base Commerce C SDK is a pre-built library that implements the Base Commerce API (which integrates Credit Card Processing, ACH processing, Secured Vault, and a Push Notifications Platform). The Base Commerce SDKs are available in other languages as well. This allows developers to drop the library into applications and start communicating with the Base Commerce platform.
Plagiarism is a hot topic. The (ex) German Education Minister did it. George Harrison (yes, that one) did it. Jonah Lehrer, formerly of The New Yorker, did it (and got paid $20,000 for confessing!). As Pablo Picasso put it, "Good artists copy, great artists steal," but so do lots of other people.