Oypo and Gallery

Oypo is a Dutch company that provies printing and shipping of photographs to photographers.
You make your pictures available for sale through them, and for a fixed fee the will sell the pictures to customers.
They provide 2 ways of 'integrating' their services into ones webpage:
1. Loading a gallery they create into an iframe
2. Using your own gallery, creating some sale elements ('add to cart'-button etc) using a script from their server.