docs: def get_sub_accounts_of_account(self, account_id, recursive=None):
          """
          Get the sub-accounts of an account.
  
          List accounts that are sub-accounts of the given account.
          """
          path = {}
          data = {}
          params = {}
  
          # REQUIRED - PATH - account_id
          """ID"""
          path["account_id"] = account_id
  
          # OPTIONAL - recursive
          """If true, the entire account tree underneath
          this account will be returned (though still paginated). If false, only
          direct sub-accounts of this account will be returned. Defaults to false."""
          if recursive is not None:
              params["recursive"] = recursive
  
          self.logger.debug("GET /api/v1/accounts/{account_id}/sub_accounts with query params: {params} and form data: {data}".format(params=params, data=data, **path))
          return self.generic_request("GET", "/api/v1/accounts/{account_id}/sub_accounts".format(**path), data=data, params=params, all_pages=True)