Account the composed transaction belongs to.

Transaction amount in account currency.

Custody order id for custody withdraw transaction, null otherwise.

Optional transaction data if available.

Transaction destination, i.e. destination address for crypto transactions or user id for fiat transactions.

Maximum transaction fee.

Transaction nonce to prevent double spend.

Signed transaction for a crypto transaction, null otherwise.

Transaction type, 'FIAT', 'CRYPTO', 'NOMINATED' or 'CUSTODY-WITHDRAW'.