You've probably seen the big warning notices on the documentation already, so consider this a final reminder... The Yahoo! Photos API will become unsupported on September 20th (today), the date when Yahoo! Photos is set to close.
"Unsupported" means that the API calls may continue to work as long as the Photos back-end systems are still powered on and able to speak to the world. But we will not be monitoring them or offering help or advice on working with them.
While we're talking photos, many Yahoo! Photos users have been moving their photos to Flickr. So we encourage you to have a look at the Flickr APIs for all your future photo mashup and application needs. You'll be in good company.
Yahoo! Developer Network