Mike here, from the Uber API team. The Request A Ride endpoint is currently only available on a whitelist basis. We'd love to hear your ideas on the integration if you'd like to share them with us!
Hey Mike! I had an idea for using the Uber Request A Ride endpoint for an app/site to allow bars/clubs to use Uber for getting impaired drivers home (ordering a ride for them). Would this be grounds for whitelisting?