This is string definition to set a route's activity icon for a set embedded in the app, or to tell the app surface to look for custom icons. These are the base set of icons, which can be bespoke image files client by client in the app. There is also the ability to send another option that below, if the corresponding bespoke image is included in that clients app. The standard options available are :
• "walking"
• "running"
• "cycling"
• "horseriding"
• "driving"
• "motorcycle"
• "kayak"
• "paddleboard"
• "swimming"
• "hunt" - Treasure hunt
• "nature" - Nature trail
• "custom" - This will tell the app to instead look for custom light and dark icon urls
{
"activityIcon": "horseriding"
}