These are Result Codes that communicate success (200) or failure (400) at the transaction level: bad sequence numbers, insufficient balances, insufficient fees, etc.
RESULT CODESTELLAR PROTOCOL CODE
The transaction succeeded.
One of the operations failed (none were applied).
The ledger closeTime was before the minTime.
The ledger closeTime was after the maxTime.
No operation was specified
sequence number does not match source account
too few valid signatures / wrong network
fee would bring account below reserve
source account not found
fee is too small
unused signatures attached to transaction
an unknown error occured