The argument object for MessageApi.sendMessage
An optional attachment
The deadline when after how many minutes the transaction will be discarded, if it was not processed, e.g. due to very low fee
The fee expressed in Planck
Using this field allows to make a transaction dependent on other transactions.
The senders private key, i.e. the crypto.Keys.signPrivateKey If the private key is not given, then the transaction method will return the unsigned byte string. The transaction won't be processed until the unsigned bytes are being signed and broadcasted using TransactionApi.signAndBroadcastTransaction
The senders public key, i.e. the crypto.Keys.publicKey