"unset") The fee estimate mode, must be one of (case insensitive):
                                      "unset"
                                      "economical"
                                      "conservative"
       "replaceable": bool,           (boolean, optional, default=wallet default) Marks this transaction as BIP125-replaceable.
                                      Allows this transaction to be replaced by a transaction with higher fees
       "solving_data": {              (json object, opti