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- Meta is introducing WhatsApp usernames. Customers will be able to hide their phone numbers when messaging businesses.
- When that happens, you’ll need to use a new identifier called Business-Scoped User IDs (BSUID) instead of phone numbers.
- For an easier transition & intercompatibility between BSUIDs and phone numbers, Meta will also launch a feature called the Contact Book. It automatically maps customers’ phone numbers to BSUIDs from conversation events even before username adoption begins, so most of your base is already protected automatically.
- The April – June period will be a live testing and adoption window. BSUIDs will be visible in webhooks, Contact Books will be building up mappings, but username adoption won’t start yet. Use this time to understand the change, not to panic-build.
- Nothing breaks until username adoption begins in June 2026 and even then, only for net new conversations from users who have adopted usernames.
- 360Dialog, will provide full specs, examples, and implementation support as the
rollout happens.You won’t have to figure this out alone.