Participant Metadata Set is valid 7 days from the time it was fetched. The exact date and time is found in the field notvalidafter.
Each participant is required to retrieve a new list with a frequency of at least two times the interval value. Currently interval is set to 24 hours. In other words: Every second day.
Each participant is responsible for
- retrieving the list and store it in their central/master system
- distributing the list to their own units, think validators
Since 2021-12-07, participants are recommended to cache the Participant Metadata Set for up to 1 hour before making an attempt to update it. This value is specified by the Cache-Control max-age response header. After that it is recommended to use ETag and the If-None-Match request header to conditionally get a new Participant Metadata Set only if it is updated. If update is not possible for some reason, the previously fetched Participant Metadata Set is valid for 7 days.
More information in MTS4, found at https://bitbucket.org/samtrafiken/bob-mts-4-coordination-and-key-management/src/master/mts4.pdf