Submit a new funding offer.
Order Type (LIMIT, FRRDELTAVAR, FRRDELTAFIX)
Symbol for desired pair (fUSD, fBTC, etc..)
Amount (positive for offer, negative for bid)
Daily rate
Time period of offer. Minimum 2 days. Maximum 120 days.
Optional see https://docs.bitfinex.com/v2/docs/flag-values
200