A system may receive, at a site, a first message for authentication from a browser hosted on a user device; send, from the site, a redirect universal resource locator of a partner system to the browser; receive a response from the partner system via the browser, the response including a second message indicating whether an authentication of a user of a first device, at the partner system, was successful; determine whether the authentication has been successful based on the second message; and register the first device when it is determined that the authentication has been successful based on the second message.