Here you will find information about all the most common questions and tasks relating to When I Work. There is also information for developers to use as they integrate When I Work into their own solutions.
Before you can start developing, you'll need a When I Work account. You can make one for free here: http://wheniwork.com/signup
After you've created an account. Login and create your application in the developer section of the site. Click the "developer" link in the footer of the application.