Tai.VenueAdapters.Binance.CancelOrder.send_to_venue

You're seeing just the function send_to_venue, go back to Tai.VenueAdapters.Binance.CancelOrder module for more information.
Link to this function

send_to_venue(venue_symbol, order_id, credentials)

See ExBinance.Private.cancel_order_by_order_id/3.