private Map<String, Object> buildPayload(final Map.Entry<User, List<VerificationDocumentRejectEvent>> entry)
    {
        final Map<LocalizedField, LocalizedField> rejectedDocuments = entry.getValue().stream()
                .collect(Collectors.toMap(this::getDocumentType, this::getRejectReason, (first, last) -> last));

        final HashMap<String, Object> payload = new HashMap<>();

        payload.put(NotificationKey.NAME, notificationDataManager.getUserName(entry.getKey()));
        payload.put(NotificationKey.REJECTED_DOCUMENTS, rejectedDocuments);

        return payload;
    }