Migrating Your Existing WhatsApp Number to the Business API

The number printed on your storefront, saved in thousands of customer phones and listed on your business profile is an asset. Moving to the WhatsApp Business API does not mean giving it up — existing numbers can be migrated. What it does mean is a one-way door that deserves preparation.

Three Rules to Know Before You Start

• A number lives in one place at a time. Once it moves to the API, the WhatsApp Business app account for that number is removed and conversations are handled through your connected interface instead.
• App chat history does not travel with it. The backup stays on the device, but the API side starts empty. Export anything you need to keep.
• The number must be reachable for verification. A code arrives by SMS or voice call during migration, so you need physical access at that moment.

Preparation Checklist

Migration itself is quick; preparation is where the time goes. Do not start until these are done:

• Business verification completed on your Meta Business account, so your messaging limits start at a workable tier.
• Two-step verification PIN known or reset in advance — a forgotten PIN can add days of waiting.
• Critical conversations exported from the app.
• Profile details saved: business name, description, address, hours and catalog entries you will re-enter on the API side.
• Away and greeting message texts copied, so they can be rebuilt as assistant flows.

Timing the Move

During migration the number briefly stops receiving messages. The window is usually short, but a busy hour turns it into lost orders. Pick the quietest slot in your week and keep it away from campaign launches or seasonal peaks.

Step by Step

• 1. Register the number on the API side and choose SMS or voice verification.
• 2. Delete the app account exactly when the flow asks — skip this and the code never arrives.
• 3. Enter the code and set a two-step PIN, then store that PIN in your password manager.
• 4. Wait for display name approval. Promotional phrasing is rejected; use your real business name.
• 5. Connect the webhook and confirm inbound and outbound messages with a live test.
• 6. Upload templates — quick replies from the app must be re-approved as templates.

The First 48 Hours

Watch three things: whether every inbound message reaches your webhook, whether templates are actually delivered, and which messaging tier the number sits in. Newly registered numbers start with a conservative daily limit that grows with healthy traffic.

Common Mistakes

Rollback Planning

Moving a number back to the app is possible but not instant, and it costs a second outage. Treat it as a last resort. A safer path is rehearsing the whole migration on a spare number first, then moving the number that matters.

Migrating with BozLat AI

Our setup covers the migration plan itself: readiness checks, choosing the low-traffic window, submitting templates ahead of time and monitoring the first 48 hours. See the pricing page for scope and plans.