All possible statuses for a Payout item are the following:

result[].status.coderesult[].status.reasonDescription
FAILEDINVALID_DESTINATIONItem was received and could not be processed. Destination account has a problem.
FAILEDPROCESSING_ERRORItem was received and could not be processed. Generic error.
PENDINGItem was received and will be processed soon.
SUCCESSItem was received and processed successfully.