Add Favorite Trip Old
From EveryTrail API Developer Documentation
To mark a trip as a favorite for a user, HTTP POST to http://www.everytrail.com/api/user/addfavoritetrip
with the following variables:
- uid - User ID of the user
- trip_id - Trip Id of the trip being marked as favorite
Return XML:
<favorite> <user>uid of the user following</user> </favorite>
