API lookup requests

We're building a taxonomic database, where references are assigned to nodes in the taxonomic tree. Our aim is to link the nodes to references stored within Zotero by means of storing the Zotero identifier with each node. Since most of the time we only need to display basic metadata such as title, author and year, it makes sense for us to also cache this data in our system in order to save on API lookup requests. Therefore, we will need a means of refreshing the data in case it becomes stale, so that if e.g. there was originally a typo in the title, which was later corrected in Zotero, our system could pick up on the change. What would be the recommended way of achieving this -- is there some notifications feed or callback to allow us to discover changes to references in a private group?

Any comments are highly appreciated. Thanks!
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