Possible follow-up actions.

UNKNOWN Unknown action.
VIEW_DETAILS View order details action on merchant side.
MODIFY Modify order action.
CANCEL Cancel order action.
RETURN Return order action.
EXCHANGE Exchange order action.
EMAIL email action.
CALL Call action.
REORDER Reorder action.
REVIEW Review order action.
CUSTOMER_SERVICE Contact customer service.
FIX_ISSUE Direct to merchant site or app to fix the issue.