Field to describe a fixed date range in which the card is usable for purchases, replaces the validityPeriod if used. After the specified date, the card is automatically terminated. If not provided, the card is active until the validityPeriod ends. Date needs to be provided as yyyy-mm-dd and is treated inclusive, meaning the card will be terminated one day after this date. If used, the parallel usage of card controls regarding dates and/or times is not allowed and the validityPeriod will be set to 36 months automatically. The latest possible date is the end date of the validityPeriod. The fields validFrom, validTo and validTimezone need to be used together. This feature is only available for cards with a cardConfig containing TRAVEL or TRAVEL_CC, marking them as travel cards.