extraParameters

Additional protocol / operation specific key-value parameters: For UTXO-based blockchain input selection, add the key inputsSelection with the value set the input selection structure. The inputs can be retrieved from the Retrieve Unspent Inputs endpoint. For RAW operations, add the key rawMessageData with the value set to the raw message data structure. For CONTRACT_CALL operations, add the key contractCallData with the value set to the Ethereum smart contract Application Binary Interface (ABI) payload. The Fireblocks development libraries are recommended for building contract call transactions.