add_user_to_group

Add a user to a group

POST https://secure.splitwise.com/api/v3.0/add_user_to_group

Parameters:

  1. group_id and user_id, or
  2. group_id, first_name, last_name, email
    1. should send an invite if successful and account does not already exist

Return value:

  1. {:success ⇒ true/false, :errors ⇒ [any errors]}