One of the worst parts of the Authorize.net (and similar) era was not their terrible documentation, it was all of the half-complete library implementations. Mos

One of the worst parts of the Authorize.net (and similar) era was not their terrible documentation, it was all of the half-complete library implementations. Most only implemented the small subset of Authorize.net API calls that the engineer required and nothing more. Thus most shops had to roll their own, or fork and add to another library and there was no coherency between libraries. Now APIs are being treated as first class citizens, rather than an afterthought, and libraries are released alongside product launches rather than being tacked on a decade later. So much better.