An example system is configured to (i) receive, from a user device over a WAN, a request for an authorization code corresponding to a media application on the user device, (ii) based on the request, transmit, to the user device over the WAN, the authorization code, (iii) receive, from a media playback system over the WAN, an authorization request that includes the authorization code, (iv) determine that the authorization code in the authorization request is valid, (v) based on determining that the authorization code is valid, generate an authorization token, (vi) transmit, to the media playback system over the WAN, the authorization token, (vii) receive, from the media playback system over the WAN, a media request including the authorization token, and (viii) responsive to the media request and a determination that the authorization token is valid, transmit, over the WAN, media content to the media playback system.