The Photo Printing API document summarizes Pwinty, a photo printing API that allows app developers to easily integrate worldwide photo printing fulfillment into their apps. Pwinty was founded by Tom Gallard and aims to compete with large photo printing companies like Snapfish and Photobox by reducing integration time from weeks to days. Pwinty has raised £125k in funding, become cashflow positive requiring no further funding, and works with large global printers to fulfill photo orders internationally.