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Labels
Business-account labels — tag chats so the CRM you're building can categorise without storing extra metadata. Available on WhatsApp Business accounts only.
POST/v1/channels/:id/labelsBearer · API key
POST/v1/channels/:id/labels/:label_id/chatsBearer · API key
DELETE/v1/channels/:id/labels/:label_id/chats/:jidBearer · API key
Create body: { "name": "VIP", "color": 4 }. color is 0..19 matching the WhatsApp Business app's palette.
Attach: { "jid": "5511999000100@s.whatsapp.net" }. List endpoint is on the roadmap (requires an app-state snapshot the gateway doesn't yet keep).