Set a distribution center's inbound carton capacity for one calendar date. distribution_center_uuid must be one of your distribution centers (404 otherwise) and capacity_date is a calendar date (YYYY-MM-DD, no time or timezone). A distribution center has at most one record per date: a second one is a 409, so change the existing record with PATCH /update/{uuid} instead. A date with no record uses the distribution center's max_cartons_per_day. uuid and the audit timestamps are server-managed.