All code is completely uncommented.

[m-sundman]

The code is completely uncommented, and the docs on globalpayments website are incredibly incomplete, it makes using this code almost impossible. E.g., the docs on the website says that some field will be "populated by the SDK" but neither does it say what part of the SDK to use for that, nor is any part of the SDK documented properly for someone to figure it out. This is not open source. Open source includes comments that make the source usable.