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Sender's platform identifier. For WhatsApp this is the phone number (without leading `+`) when available, otherwise the `businessScopedUserId`.
contact_id
String
Zernio CRM Contact id for this sender, when one exists (omitted for outgoing/business sender).
[optional]
name
String
[optional]
username
String
[optional]
picture
String
[optional]
phone_number
String
WhatsApp only. Sender's phone number in E.164 format (with leading `+`). Nullable during the BSUID rollout (April 2026+). WhatsApp users who adopt a username can message businesses without exposing a phone number — this field is omitted for them. Match by `businessScopedUserId` instead. See `docs/whatsapp-bsuid-migration.md`.
[optional]
business_scoped_user_id
String
WhatsApp only. Business-scoped user ID (BSUID) — Meta's canonical identifier for a WhatsApp user within your business. Present when Meta includes it in the inbound payload (rollout in progress since early April 2026). Recommended primary identity anchor going forward; fall back to `phoneNumber` only when this field is absent.
[optional]
parent_business_scoped_user_id
String
WhatsApp only. Parent BSUID for businesses with linked business portfolios. Omitted for standalone portfolios.
[optional]
whatsapp_username
String
WhatsApp only. User's WhatsApp username (e.g. `@jane`). Not a stable identifier — users can change it. Useful for display, not recommended as an identity anchor.