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BSUID Support — Response Enrichment: Contact objects in the response now include additional identifiers:

New Field	Type	Description
bsuid	string/null	Business Solution User ID — stable cross-channel identifier
username	string/null	Human-readable username handle
parentBsuid	string/null	Parent BSUID — enterprise-level identifier

The existing phone field remains present but is now nullable (omitted via NullValueHandling.Ignore when null). The id field (Contact ID) continues to be always present.