def previous_page(params = {}, opts = {})
      first_id = data.first.id

      params = filters.merge(ending_before: first_id).merge(params)

      list(params, opts)
    end
def previous_page(params = {}, opts = {})
      first_id = data.first.id

      params = filters.merge(ending_before: first_id).merge(params)

      list(params, opts)
    end
Fetches the previous page in the resource list (if there is one).

 This method will try to respect the limit of the current page. If none
 was given, the default limit will be fetched again.