Returns every error currently open for the user: a disconnected channel account, a price, availability or minimum-nights change a channel refused, a listing content push a channel refused, a scheduled message or review that failed. It is read from the same records the type: "error" webhooks come from, so use it to recover after a missed webhook. Failed messages are listed for 30 days. OAuth clients only see the codes their scopes cover (accounts:read for account.*, calendar:read for calendar.syncFailed, listings:read for listing.*, messages:read for message.sendFailed, reviews:read for review.submitFailed).