def METHOD_NAME(self, issuance_uuid):
    """
    Find previously initiated issuance line for processing.
    """
    issuance_line = IssuanceLine.objects.filter(uuid=issuance_uuid).first()
    if not issuance_line:
        msg = _("Couldn't find such issuance line: [{issuance_uuid}]").format(issuance_uuid=issuance_uuid)
        logger.exception(msg)
        raise ValidationError({"issuance_uuid": msg})
    # double check credential is still active:
    if issuance_line.status in self.INACTIVE_STATUSES:
        msg = _("Seems credential isn't active anymore: [{credential_id}]").format(
            credential_id=issuance_line.user_credential.uuid
        )
        logger.warning(msg)
        raise ValidationError({"reason": msg})
    return issuance_line