Fetches the data to populate the campaign leaderboard.
- limit: Total number of leads to return from the top. Max 50.
- lead_description: How you want the leads identified. Options include “first_name”, “full_name”, “social_id”, or the name of a custom data field you’ve collected for leads.
- avatar_default: “identicon”, “icon”, or “ui”.
- Social ID: The ID of a lead if you’d like them flagged in the return data.