Tai.Venues.Adapter.maker_taker_fees

You're seeing just the callback maker_taker_fees, go back to Tai.Venues.Adapter module for more information.
Link to this callback

maker_taker_fees(venue_id, credential_id, credentials)

Specs

maker_taker_fees(venue_id(), credential_id(), credentials()) ::
  {:ok, {maker :: Decimal.t(), taker :: Decimal.t()} | nil}
  | {:error, shared_error_reason()}