Explain your inclusion of payment_id in your description of how to do a transfer since it would seem that only three arguments are needed, and one would not need to specify whatever payment_id is to issue a transfer command.

For example, in bytecoin wallet, if you type the word: transfer  (and hit enter) then what you get is the following:

"Error: wrong number of arguments, expected at least 3, got 0"

This implies that only mix (a number from 1 - 10), the public address to where you want to send, and the amount of bytecoin are needed.

This is borne out by the following references:

https://wiki.bytecoin.org/wiki/Wallet_commands  (See the transfer command arguments, there are three)

http://bytecoiner.org/guides.php#l6 (Under the 'Transactions and Buying' section [note that the mix number shows as 1-100 but should show as 1-10]).  There are three arguments.  payment_id does not show up.