abstract suspend fun initSpend(zatoshi: Long, toAddress: String, memo: String, fromAccountIndex: Int): PendingTransaction
Initialize a spend with the main purpose of creating an idea to use for tracking it until completion.
zatoshi - the amount to spend.
toAddress - the address to which funds will be sent.
memo - the optionally blank memo associated with this transaction.
fromAccountIndex - the account from which to spend funds.
Return
the associated pending transaction whose ID can be used to monitor for changes.