From their site: Welcome to MOO. We're a printing company. Customers create a pack and then the pack is printed to pre-defined products. Create an XML document to determine where the user is placed in the process. For example, if you define a list of images that you want the user to select from to make a pack of cards, then they will be forwarded to the 'chooser' page. If you specify a list of images that you want them to actually use, and the 'crop' data associated with them then the user will be sent to the part of the process where they design the back of the cards.
The following is a list of SDKs from our SDK directory that matched your search term. Though your definition of an SDK may differ, in our world, we define SDKs as platform- specific tools for consuming existing APIs of the sort we list in our API directory. For example, the Ruby SDK for consuming the Twitter Ads API. If you think an SDK, API, or other asset is missing from our directory, be sure to check our guidelines for making contributions to ProgrammableWeb.
The MOO PHP SDK by Jonathan Oddy is an unofficial resource to interact with the API. Resources provide installation and usage. Examples demonstrate authorization with Api Key and Api Secret, in addition a request and a response to create a pack of business cards.