Incorporating a unique ID field into Centova-provided metadata

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We are creating a master music database for tracks, their labels and ISRC codes to make royalty reporting easier.

We are using the XML/JSON widget feed provided by Centova to get the track metadata provided by a live DJ or AutoDJ, but we need to tie the Centova metadata to our own database by a unique id for each track.

We can see a "royaltyid" field (and an "id" field) in the Centova metadata which sounds hopeful, but it appears to be limited in scope and apply only to the AutoDJ.

How can we populate a unique track ID field so it is sent with the Centova metadata?

Many thanks in advance for any suggestions.